I have an 18 x 33' above ground just put in. The long side on right is going to need a retainer wall, we have that in mind. After that, what is the best to put down all around pool? We were tentatively thinking plastic, then pavers and finally heavy stone. Does this sound right? It is to be somewhat decorative but mostly to keep water from flowing underneath pool from high side and creating ruts through the sand below. Thoughts?