Frisco Woods.
I spent every other weekend there all through the 80s.
Come out of the campground turn right, then about a mile down on the left is an opening to the beach 4x4 only.
keep going down and you can catch the ferry to the island, after you get off of the ferry take the third beach entrance on the left, then run back up the beach toward the direction of the ferry and you will find the nude areas, if they still allow it.
Bring spray for the skeeters.
dont know if they still do it but, during the easter break, we used to go down to Frisco. Everyone would get trashed then watch the less bright of the campers compete to see who could drive their truck further into the sound. Always a good time.