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Just about 17 miles from Savannah, this pure, uninhabited nature preserve is accessible only by boat, according to Visit Tybee. Temperatures in December stay around 66°F.The wilderness gem is home to rich coastal salt marshes, natural dunes and subtropical forests of live oak, pine and palm. Wildlife includes the egret, heron, white ibis and the endangered woodstork. Kayak tours are a popular way to see Little Tybee and camping is allowed.  There are plenty of affordable lodgings as well.