El Gaucho serves Argentine beef/steaks that were wonderful. You need reservations.
Half day snorkel trip with the "Fun Factory" company was lots of fun. Snorkeling at three different locations, lunch on board, and all the drinks you want are included! Recommendation: if you've never snorkeled before, get a mask and tube and practice in a pool before you go. We didn't, and learning while we were out there took away from our full enjoyment of the underwater sights.
Horseback rides travel along the beach, north of the hotels. Riding along as the horses splashed through the water was a real kick!
Enjoy yourself. It's a great place to relax and unwind.