We are going on a cruise to St. Maarten, many of our group signed up for SNUBA. Some kind of gear you put on and gives you zero gravity in the water. That sounds like a fun morning or afternoon. Kim Sha is by Buckaneer Beach bar, on Friday's they have a lot of vendors and events going on. Beach right there too so there are activities to partake in the water. Karakter is a restaurant right on the beach. Usually good food here, it can be very busy at lunch time, and parking can be a zoo over there. Lots of differences between Anguilla and Pinel, but for an afternoon, I would pick Pinel. If I could stay overnight, it would be in Anguilla. I am sure others will pipe in with ideas.