Actually only a section of the dunes is private, but yes they do it from the boat now and it is a great time, hopefully you made it there this last weekend. Quite fun with all the boats all tied up together... Like that song... Redneck Yacht Club!
We were there and did have a great time. However, some of the women on one boat (not the radio station) were quite dirty considering there were children out there. A little flashing is no big deal but they went overboard!