Dave: If it is just playing in the sand you want: John Brewer's and Smith Bay are good candidates- neither has a lot of amenities which keeps the crowds down. BYO picnic and beverages to Smith Bay There is a mobile truck and bath house at Brewer's. In January, you'll have to check on current conditions. If there is a north swell, stay on the south side of the island.

The closest beach to Havensight is Morning Star, then Bluebeard's/Lime Tree. The closest beaches to Crown Bay are Lindbergh and Honeymoon, Water Island (have to take a ferry and hike.)