I would call the resort and have them fax you a sample activities list. This won't be exact, but it still should give you a close approximation of what to expect.
As far as adult activities... Try the Green Cabin Room after 7:00pm for cocktails.

They usually have a band or singer in there every night.
Long strolls up and down the beach are also fun...
Enjoy a nice dinner for two at Sonya's.
You can also : rent Jet Skiis, Kayaks, go bike riding, take a oceangraphical institute tour, take an astronomy class, listen to a banjo, take a wine tasting class, ride a bike, play mini-golf, or if you go during Spring Training, watch the Dodgers play.