There is a set of steps that you can take down to the sea - however they are richety and we have never actually gone down to do any swimming there. The water is very shallow and there is reef all around the island that can tear up your legs if you're not careful.
Beer suds is right. I went down there and checked out the so-called beach and ran into reefs right away. Ouch, no fun! I turned right around and got back in the swim-up bar. A much more agreeable way to get wet.