Brettski, I'm a believer in landscape fabric. We get it in 12' wide rolls which is a pretty good size to work with. Theo is right and weeds will find their way in but the fabric will help separate the sand from the underlying soil, making the weeds easier to pull and require less sand replenishment. I do not have a beach but I know of three in my area. The one that has about a 12" layer of sand and fabric underneath is by far the nicest.
WARNING: Cat's like the sand too!
