I decided to take a beach towel and modify it. I first added some pockets at the bottom of the towel to hold my sunblock, water (keeping the bottom out of the sand) and my sunglasses when I cool off.
Then I took the top of the towel and made a little pocket there to hold my Kindle or book- don't want it getting wet or sandy. After I made the pocket I folded the towel back on itself and sewed the sides to hold the towel in place so it won't slip down the chair.
Now I am all set for some fun in the sun.