Ft Clinch State Park, Amelia Island

We loved this campground and the entire area. The park has two separate campgrounds - one along the river (40 sites)and the other on the Atlantic Ocean just a short walk from the beach(21 sites). We stayed on the Atlantic side and loved it for a couple of reasons - first we have a 38' fifth wheel and the sites there are easy to back into (the offical park website says 30' max for rigs, but there were other motor homes and fifth wheels there). Because is was April, we wanted sun and these sites have almost no shade. And, we wanted to be close to the beach. The sites on the river are much more shaded and we would have had a hard time getting into many of them. Each site has water and electric and there is a small shower building - older, but clean.
It took about a minute to walk from our rig to the beach and from there we could walk "forever." Hunted for seashells and sharks teeth. We had a lot of luck with shells, but struck out as far as sharks teeth. There is a very long fishing pier within walking distance from the campground. There is a large Navy base nearby and we saw three subs shipping out to sea. Very impressive. We also enjoyed walked through the large fort located within the park. It contains many artifacts from the 19th century fort. From the beach you can also see Cumberland Island National Seashore in Georgia. If you have the time, it's not an unreasonable drive head that way and take the ferry to the island.
If you need a shopping fix, Fernandina Beach has all the name-brand shopping you could ask for and the historic district is worth an afternoon if you are staying for several days.
We were lucky to get a campsite in April - there were two in the Atlantic campground that are first-come first served and we hit it just right. Otherwise, book early.