Proximity wingsuit basejumping:
I did a few tandem jumps to see if I wanted to pursue an Accelerated Freefall Program (very cost prohibitive) but then I learned the USPA requires at least 200 solo freefall jumps in an 18 month span in order to pilot a wingsuit with an instructor or 500 jumps to go solo. That's too many; it would run well into snowboarding season.
Accelerated Freefall may still be worth getting, though.