I would imagine that golf would be something that you could arrange easily with the travel concierge, probably get a foursome arranged. Since it's not really a group thing, is it? I can't imagine a golf excursion, a bus with 20 people!

We did a catamaran trip in St. Thomas to St. John that we loved, so I'm sure there must be some of those, but ours mostly involve snorkeling. I'm sure you can find canopy tours, off-road trips, etc. to keep the energy level up.

As for party boats, remember that the age demographic skews a bit older than yourself, you may have to go private for this kind of thing.