Replying to Fun stuff to do in Maryland?

I'll be in Maryland for the next 2 weeks and am looking for fun / freestyle sports related things to do. I've already planned a trip to BB for May Day but thats about it. Hard finding cool stuff.

In Geneva (hometown) you can find 4 high diving boards, 2 cable wakeparks, a water ramp, 2 trampoline centers and even a waterpark with some cool tramp features all within our tiny city limits. Dryslope and summer skiing within a 2 hour drive.

So, any thoughts? This country is too big and the boredom is killing me