Sandless beach mat
You might believe that I am crazy for even suggesting such a thing. However, you can rest assured that this product, which is manufactured using specially woven polyurethane that allows sand to permeate through and fall back on the beach. If you do not believe what is written here, why not try it out for yourself and see.
The best part is that though the sand falls through the mat, it cannot force its way back from the bottom of the mat. This is perhaps the best deal of the year. This mat is tough enough to resist abrasions from pets or outdoor furniture. The polyurethane used to manufacture it, resists mildew and mold. Costs $59.95
Check out: http://ww2.hammacher.com/Product/81157