We have been during the christmas -new years holiday 5 times. Once it was 60ish and DS did swim in the resort pool. DH and I did do outdoor hot tub another time. We just loved the relaxing mode you are in there. Other years it has been in the 30-40's with gloves and jackets! Just can't guess. We walked the beach, played pool, shuffle board, shopped, mini-golf, cooked late morning breakfasts, did many of the planned activites for kids and parents(marsh exploration, ice cream making, campfire, goofy bingo, wildlife exploration of Pinckney Island, and others. It really is our vacation without the madness of WDW(which we do at least once a year and love!). Great restaurants on the island and great gold.
Connears