You are welcome.
In Brunswick, there is
Blythe Island Regional Park & Campground. It's a county park. All sites are full hookup with cable and WiFi. There is a small catch and release pond with boat rentals and a boat ramp if you bring your own. As well as a beach for swimming. The park also borders the South Brunswick River with a marina and fishing dock. They have pull through sites and sites along the lake are back-in sites.
Jekyll Island is a state park with a campground. Although I like Blythe Island campground better, Jekyll Island is a much nicer island with lots of nature and history. Plenty of hiking/biking trails. Plenty of public beaches. When we owned our Greyhawk, we would park it in one of the parking lots along the beach and setup camp for the day. You can't camp overnight in the parking lots, but you can spend the day.
Both campgrounds are off Exit 29 of I-95 (US 17). Take 17 S to GA 303 and turn right to get to Blythe Island. The Park is about 4 miles on the right. Take 17 N to get to Jekyll. You'll see the causeway to the island (on the right) just before the Sydney Lanier Bridge. You will need to purchase a parking permit to get onto the Island.
Not a state park, but a very nice Resort is Coastal GA RV Resort (also at exit 29). It's about 2 miles from I-95. The entire resort is paved, asphalt roads and concrete pads. The sites are semi-private. It's a good base camp to explore the area. They do have a pool and the campground borders a small lake private lake which has some really nice sized Bass.
There is a 4th campground in Brunswick (also at exit 29). It used to be called Golden Isles RV Park, but recently changed names to Southern Retreat RV. It is certainly not a retreat. It's a dump. Lots of year round residents and when it rains, it floods. It used to be a Passport of America campground (not sure if it still is) and it's okay for a quick overnight stay, but I wouldn't want to camp there.
-Michael