Travel to Interlaken, Bern, what do you recommend?

I went to Interlaken several years back on a business trip and every evening we were taken somewhere or the other. We went on a boat cruise + dinner one evening. We were transported there by a horse carriage from the hotel! On the boat, there was a guy playing music on an instrument that I can only describe (don't know the name). It looked like a long horn that rested on the ground. He asked us all to give it a try - it was fun. Second day we went by cable car to the second highest peak called Jungfrau. The cable car ride was breathtaking. On my first day there I took a walk to Interlaken east station and took a train to a station in the hills, took a walk, had lovely coffee on the roadside cafe while it rained. The hotel will provide you with all the maps you want. It's a lovely place to enjoy.