The Atrium suites are only 4 to a building (2 on the ground level and 2 on the top floor). They are more island-like IMO. They have screens with shutters (not glass windows) and no TV. I'm staying in a beachfront suite, which is the same style, just closer to the ocean. Many people on this board LOVE the atrium suites.
I haven't been there yet, but some of the activities I've seen mentioned are Rick's cafe, a tour of the Appleton rum factory, horseback riding.... You can also just walk down 7-mile beach and find many things to do.
Something to make sure you pack....bug spray. Sand fleas can be a problem, from what I've read, on the beach, especially at night. Another thing you would never think of, that's romantic, strings of Christmas lights to decorate your veranda.
CSA - May 2012
CN - May 2013
CSS - October 2013