There are A/I compounds that you pass. Thing is, you can walk on the beach from sun up to sun down near the water line no matter who controls the road access. It is fun to walk through the resorts. When you approach the guard may (or may not) ask you what your room is, just tell them you are "moving through" and they will let you pass.
In other words, there are no private beaches. It is open to all to enjoy.