We actually backpacked for a two nights on the island and really enjoyed it doing a full loop and saw everything. If I only had a day I would rent bikes and knock off all the attractions on the southern portion of the island (Plum Orchard and back). Really interesting place with beautiful oaks and marsh scenery. Fort Clinch was cool to check out as well. Got to get tuna nachos at the Salt Pelican and a beer at the Green Turtle. I am not a golfer but there were some pretty courses around like at the Omni