The park is next to the navy base, elementary school and a topless bar. Ironically this is still a good place to camp. It is off of the main road but once you are in the park you are isolated from it. The sites are not very private. There is very limited tent camping - I was told at one time that they only hold 7 sites for tents. I'm not sure if that is very accurate though. Mostly you see RVs at this campground. There is a water park for small children, plenty of lake fishing, playgrounds, picnic areas and a building where they have activities and informal breakfasts. Alot of people who camp here are RVers who stay for a month or more. They recently put a limit on how many consecutive days you can stay there. The park has beach access but you can't camp on the beach and there aren't any sites next to it.
There are many trails which the mountain bikers and hikers use. They hold alot of races, surf contests and sometimes triathalons here so it is popular with the fitness crowd. Oh and the surfing is also good here at the "Poles" (look for the old pilings on the beach).
Even though the campsites are not very private there is plenty of nature throughout the park. There is also some interesting history about the area. Archeological evidence has been found dating to 2000 BC Native Americans, French explorer Jean Ribault sailed to the mouth of the St. John's and claimed the area for France. There has also been English, Spanish and Confederate forts in the vicinity. You won't find anything about this in the park though. They concentrate on nature not history.
You are very close to the mouth of the St. John's River and will see alot of ships entering the channel which is interesting to watch. Oh and bring the bug spray.