Buses leave from Interlaken every day. You can meet in town or they will pick you up at your hostel. It is about a two hour round trip. 45 minutes up, jumps and then back.
The jump itself is 85 meters (278 ft) into a glacially carved canyon, over a snow-fed river, and surrounded by the mountains of the Jungfrau Region.
This was my first of many bungee jumping experiences and I would highly recommend it. The best part was that it was part of a package deal from the outfitter in town. My suggestion would be to check out the packages available and choose the best fit for you. Options include bungee, rafting, canyoning, sky diving, etc.