Don't listen to the guy above who says you should only hit Murren.
It's Berner Oberland, so the average snowfall is pretty high for the Alps, around 700 cm per year.
You will need a car or a train pass.
Basically you have access to two of the best parks in Europe. The easier park is in Adelboden, Gran Masta Park, you can check it out at
http://www.realboarder.ch/gmp/ The park is shaped to perfection like a swiss watch and Adelboden is a massive resort if you want to kill some slopes. The gnarlier park is in Meiringen-Hasliberg, one of Europes best kept secrets. Check it out at www.freestyle-park.ch Meiringen-Hasliberg also has some easy access back country and the resort is so unknown nothing really gets tracked.
For riding halfpipe you go to Grindelwald-First, the halfpipe is only shaped on Saturdays so otherwise don't bother. From First there are also some excellent hikes just look at the map it's pretty obvious.
To get vertical you go to Murren, if snow cover allow, it has an 8000 ft. vertical and the lines are insane.
All these resorts are within 40 minutes from Interlaken.
And if you want to eat more pow pow you can go a little bit further (bout 1 hour) to Engelberg they get about 1000 cm per year. And if you wanna see something special head to Melchsee-Frutt, also about 1 hour, it's so tiny basically they have Fruttpark, a chairlift, and a bunch of back country. But it's sweet because tourism does not exist in this spot.