In a nutshell
Interlaken sits on a narrow strip of land between Lake Thun and Lake Brienz, which is exactly where the name comes from. The Höhematte, a wide green meadow in the middle of town, was deliberately never built on so the view of the Jungfrau stays open. Most visitors use the town as a base rather than a destination, because the Lauterbrunnen valley, Grindelwald and the Jungfraujoch are all short rides away. The two lakes have completely different colours, one deep blue and one turquoise, and boats run on both. If you came to Switzerland for mountains, this is the valley floor everything else branches off from.
Landmarks

Höhematte park
The green heart of Interlaken, framed by the Jungfrau peaks.

Lauterbrunnen valley
72 waterfalls cascading from vertical cliffs.

Mürren
A car-free mountain village with some of the best Alp views in Switzerland.

Lake Brienz & Lake Thun
Turquoise glacial lakes flanking the town on both sides.

Trümmelbach Falls
Glacier waterfalls thundering inside the mountain, reached by a short tunnel lift.

Staubbach Falls
A single-drop waterfall plunging almost 300 metres above Lauterbrunnen village.

Schilthorn (Piz Gloria)
A revolving mountaintop restaurant made famous by a James Bond film.

Harder Kulm
A viewpoint directly above Interlaken, reached by funicular in minutes.

Wengen
A car-free alpine village perched above the Lauterbrunnen valley.

The Aare
The turquoise glacial river that flows straight through the middle of town.
Activities

Waterfall hike in Lauterbrunnen
An easy valley walk past several of the 72 waterfalls.

Paragliding (seasonal)
Tandem flights over the valley, weather permitting.

Riverside walk
A relaxed stroll along the Aare between the two lakes.
Tours to this destination
Photos of Interlaken