Actually, unless there's an unusual spell of really cold weather (so far it's been in the high 60's and 70's), winter is a great time to do some of the things that aren't so much fun in the summer because it's too darn hot. Go to Savannah, a great old South city (try to trolley tour). Also, Beaufort is a charming smaller town to explore for an afternoon. Go to Sea Pines and rent a bike - they have the best bike paths. If it's not too cold, try a kayak tour through the marsh - strong possibility of having dolphins nearby. If you're a shopper, there are a couple of huge outlet malls right off the island. Have a great time.