Kayaking and paddleboarding on Lake Brienz

Why paddlers head for this lake specifically

Lake Brienz is the sharper-looking of Interlaken’s two lakes: a turquoise-grey colour that comes from glacial rock flour suspended in meltwater from the Aare, a depth of 261 metres, and steep, forested banks that drop almost straight into the water. It is also colder and quieter than Lake Thun — fewer motorboats, fewer swimmers, and a shoreline path that makes it easy to launch a kayak or paddleboard without a car.

That combination is why it has become the default lake for anyone in Interlaken who wants to paddle rather than just cruise, and why the crossing to Iseltwald has become the thing most people are actually aiming for.

None of that makes it a forgiving lake. The water stays cold all summer, the crossing to Iseltwald is open water with genuine boat traffic, and a wind pattern that builds most afternoons catches people out every season. This guide covers where to put in, who rents equipment, what the Iseltwald crossing actually involves, and the rules that keep you out of the way of the passenger boats.

Where to put in

Three places handle almost all of the recreational kayak and SUP traffic on the lake. None require a permit to launch a hand-carried, non-motorised craft.

Launch point	Access	What’s there
Interlaken Ost lakeside path	5-minute walk from Interlaken Ost station	Rental hut, shallow shelving beach, closest to town accommodation
Bönigen public beach	20-minute walk or short bus ride from Interlaken Ost	Larger beach, dedicated swimming zone marked off from the launch area, popular with families
Iseltwald harbour	Boat or car from Interlaken, roughly 20 minutes by road	Small rental point, natural finishing point for a one-way paddle back by boat

Wild launching along the shore between these points is possible in a few spots but the bank is steep and often private garden frontage, so most paddlers stick to the three points above. There is no dedicated launch on the north shore near Brienz itself, though a couple of hotels there rent SUPs directly to guests.

Renting a kayak or paddleboard

Rental huts at Bönigen and Iseltwald open from roughly May to late September, weather and staffing permitting, and close for the day if the wind forecast looks bad — worth a phone call ahead if you’ve built a whole afternoon around it. Expect these approximate 2026 prices, all in Swiss francs and all subject to seasonal change:

Equipment	Per hour	Half-day (approx. 4 hrs)	Notes
Single kayak	CHF 25–30	CHF 60–70	Sit-on-top, stable, fine for beginners
Tandem kayak	CHF 35–40	CHF 80–90	Two adults or one adult and a child
Stand-up paddleboard	CHF 25–30	CHF 60–70	Slower than a kayak, more exposed to wind

Life jackets are included and, in practice, expected to be worn — the water is too cold and too deep for anyone to reasonably skip one. Bring a dry bag if you’re carrying a phone; none of the rental craft have watertight storage built in. Card payment is normal but a handful of smaller operators are cash-only, so it’s worth carrying some francs as a backup.

If you’d rather not manage logistics, timing, and the crossing yourself, a guided option removes most of the uncertainty:

a half-day guided kayak trip on Lake Brienz covers equipment, a safety briefing, and a guide who knows the wind pattern for that specific day — useful if you’re set on reaching Iseltwald but don’t want to be the one deciding whether conditions are still safe.

The crossing to Iseltwald

Iseltwald sits on the lake’s south shore, roughly 5 kilometres from Interlaken Ost by water hugging the shoreline, or a more direct crossing of around 2.5 kilometres if you cut across open water from Bönigen. The village has had a surge of visitors since a single tree on its jetty appeared in a Korean drama series, and while the tree itself draws day-trippers by road and boat, arriving by kayak from the water is a genuinely different way to see it — the approach past the little harbour and church spire is the view most people never get.

Realistic timing: 1.5 to 2 hours each way by kayak along the shore, faster if you take the direct line across open water but with more exposure to wind and boat traffic doing so. A paddleboard takes noticeably longer — budget 2 to 2.5 hours each way — and tires people out faster than they expect, since standing and balancing uses more energy than sitting in a kayak seat.

Practical version of the trip: launch from Bönigen or Interlaken Ost in the morning, paddle to Iseltwald, stop for coffee or lunch by the harbour, and either paddle back before the afternoon wind builds or take one of the scheduled lake boats back with your kayak left for a rental company to collect — check with the rental operator in advance whether this is an option, since not all of them offer it.

For a different angle on the same stretch of shoreline without the paddling effort, a scenic jetboat ride on Lake Brienz covers a similar route at speed, which suits anyone who wants to see Iseltwald and the lake’s colour without committing to a multi-hour round trip.

The afternoon wind that catches people out

Lake Brienz sits in a narrow valley aligned roughly east–west, and on clear, warm days a thermal wind builds along that axis as the mountain air heats up and starts to move. It typically starts building from around midday, picks up through early-to-mid afternoon, and can raise a short, steep chop within thirty minutes on a lake that looked flat at breakfast. This is the single biggest reason paddlers get into trouble here — not big storms, but an entirely predictable afternoon pattern that people don’t ask about before launching.

The practical response is simple: treat the morning as the paddling window. Launch early, aim to have any crossing finished by midday, and check with rental staff before you set out — they watch this pattern every working day and will usually tell you plainly if that afternoon looks like a bad one. If the wind does pick up while you’re on the water, the right move is to head for the nearest shore rather than trying to push directly back to your launch point against wind and waves; on Lake Brienz that nearest shore is rarely more than a few hundred metres away if you’ve stayed reasonably close to the bank.

Rental operators at Bönigen and Iseltwald will not usually stop you paddling on a windy afternoon, since it’s still legal and their equipment is still available, but several will say clearly that they wouldn’t do the crossing themselves that day. That’s worth listening to.

Navigation rules and lake etiquette

Lake Brienz carries scheduled passenger boats, private motorboats, and a fair amount of summer traffic, all sharing water with kayaks and paddleboards that sit low and are hard to see. A few rules keep everyone apart:

• Give way to scheduled boats. The passenger vessels running between Interlaken, Iseltwald, Giessbach, and Brienz have limited manoeuvrability and fixed timetables; a kayak crossing their path should always give way, not the other way round.
• Keep clear of marked shipping lanes near the piers at Interlaken Ost, Bönigen, Iseltwald, and Brienz, where boats are docking or departing. These are usually the busiest few hundred metres of any crossing and the place to cross quickly and directly rather than lingering.
• Wear a buoyancy aid. It’s standard practice with every rental and effectively expected of anyone on the water given the water temperature and depth, even for strong swimmers.
• Stay visible. Bright equipment and clothing help; paddling at dusk or after dark without lights is best avoided altogether rather than managed.
• Respect the shoreline near private jetties and swimming zones, particularly the marked bathing areas at Bönigen and Interlaken Ost, which are kept clear of paddle traffic for swimmers’ safety.

None of this is complicated, but it matters more here than on a smaller, quieter body of water because the scheduled boats run a genuine timetable and the crossing to Iseltwald puts small craft in open water for a sustained stretch.

Water temperature and what to wear

Surface temperature on Lake Brienz runs roughly 14–17°C through early summer and rarely climbs much past the high teens even at the height of August, consistently colder than the more sheltered Lake Thun. That’s cold enough that an unplanned swim is a genuine shock rather than a mild inconvenience, which is part of why the buoyancy aid and staying near shore both matter more than they might on a warmer lake.

Most paddlers manage fine in normal summer clothing plus a change of dry layers left at the launch point, rather than a wetsuit, provided they’re not planning to be in the water rather than on it. A hat and sunscreen matter more than most people expect — there’s little shade on open water and the glare off the pale turquoise surface is stronger than it looks.

Alternatives if paddling isn’t for you

Not everyone wants to manage a kayak for two hours each way, and the lake rewards a slower look at its colour and shoreline in several other ways. An e-bike tour along the lakeshore covers similar ground on the shore path at a fraction of the physical effort and without any wind risk, while an quad tour to Iseltwald and Lake Brienz reaches the same village by a completely different route through the hills above the shore.

For a lower-effort look at the water itself, the scheduled lake boats covered in the Lake Brienz boat trips guide run the full length of the lake on a fixed timetable and stop at Iseltwald and Giessbach without any of the timing or wind calculations a kayak trip requires. The two lakes cruise guide covers combining a Brienz crossing with a look at Lake Thun on the same day.

Planning the rest of the day around it

A morning paddle to Iseltwald and back leaves most of the afternoon free, which matters given the wind pattern pushes most people off the water by early afternoon anyway. The Giessbach falls and shore path walk connects naturally if you’ve come by boat rather than paddled the full return leg, and anyone spending several days around the two lakes should check the swimming in Lake Thun and Lake Brienz guide for where the water is actually pleasant to be in rather than just to look at.

For wider trip planning, the best time to visit Interlaken guide covers which months give the calmest lake conditions, and Interlaken in summer sets watersports in the context of the rest of the summer season.

Anyone combining this with hiking or mountain excursions on the same trip should also see the altitude, weather and what to pack guide, and first-time visitors in general may find the common mistakes guide useful before finalising a plan. The day trips from Interlaken guide sets Iseltwald and the lake in the context of everything else reachable in a single day from town.