We were there for the first week of April this year, and are going back for the same time frame next year. Yes, it was windy, but the sun was strong, and the wind was a blessing, cooling it off just enough. It made for some great days of sailing on the Hobie Cats! The water at SSB was beautiful, warm and crystal clear. In fact, the last 2 days of our stay, the wind died down completely, and the water was perfectly calm. It's a wonderful time to be at CSS!
The AN beach at CSS sits in a little cove, so it is a bit sheltered from the wind. CTI, on the Island, is quite windy. We were there (at CTI) in May of 2009 and we didn't like the windy conditions on the island.