Good sight to see if your in the area. The cave was very interesting to see, with a stunning view of the surroundings. Upon arriving to site, you must walk up about 150m to the main level, where there is the entrance to the cave, as well as a quick lunch spot, and the sit-down restaurant Stein & Sein. The walk up is strenuous as it is a steep incline. I had lunch at the Stein and Sein that was lovely. I had a steak with potatoes/vegetables. Well worth it, as the quality of the food was up to Swiss standards and the tables all have really great views of the lake. The walk through the cave is about 1.5 km (approx. 1 mile) long, with a slight degree of difficulty due to the steep inclines (not as steep as the initial climb though) and numerous stairways throughout. Total, it takes about an hour. The weather in the cave stays at a constant 8-10 deg C all year round so its quite comfortable to walk around in the summer. If you get cold easily, I recommend a light jacket, however with all the climbing throughout, you tend to warm up a bit. It can get quite damp inside the cave, and the floors tend to be a bit wet, so I would advise flat shoes with a standard grip - normal tennis shoes would be fine. Note, that there is also a museum on the first "level" from the ground up. Entrance is free with the entry ticket to the cave. They have toilets there, and you can purchase drinks and ice cream. There are a couple tables next to the museum to sit and relax.