Its a small town in a very pristine part of the world. It caters almost exclusively to tourists though so don't be suprised at the thin number of locals. The locals are friendly and helpful and English is widely spoken. There are a ton of things to do here in the outdoors. Lots of adrenaline seeking activities especially. The whole place is particularly expensive though. More so than the rest of Switzerland. Hope you get good weather and enjoy.
Insider Tip:If your regularly fit than the hiking trails are plenty and also free. They offer amazingly good views and it is quite a sense of achievement when you reach the top of the trail. If your not so active then take a cable cars. I would recommend catching the train from Interlaken Ost down South to Lauterbrunnen and exploring the myriad of hiking and biking trails here. If you catch the cable car, there a few trails which are mostly flat whilst offering breathtaking views.