Just a personal opinion, but IMO it would be tacky to go there and use their facilities - ie bathrooms in particular - and not eat and or drink from their restaurant. I suppose you could but.............

And I do agree with Elaine that all beaches on the island are public. But you can see this particular location has - not once, but twice - thanks to that b itch Irma - made an incredibly significant investment in their beach location and they do strive to treat you extremely well there. There are some things worth paying for and from my personal perspective, this is one of them. But not everyday...........