We stayed at Skidaway back in April. Great campground in a great area and just a short drive to Savannah. Already planning a trip back next year b/c we only spent one day looking around the city (tons to see).
Spent one day checking out Tybee Island and Fort Pulaski which my kids loved. UGA Aquarium and Skidaway Institute of Oceanography are only a few minutes away from the campground. Wish we were there longer.
Only bad part at that time of year was the gnats. I guess people up there are used to them but they were bad even in the city.