Interlarken is located near the Swiss Alps. Its name, literally means between 2 lakes is a good description as it is between 2 lakes. It is a famous tourist destination, but when you get there, there is nothing special.
The road to Interlarken is spectacular! Lauterbrunnen and Grindelwald is just around the corner. I'd suggest driving by Interlarken and walking around, but don't spend too much time there. Its nice, but expensive.
Here are some photos.