On one of the Aruba bb's (can't remember which) there was a question about a gimmick that keeps beach towels on the chairs, secure from the lovely Aruba wind. Last year I bought two such things after reading about the ideas on one of the bb's (again, can't remember which; guess it's the hour I'm writing this, or one of my senior moments).
One is on line from Bed, Bath & Beyond, and they're called Boca Towel Clips that come in pairs in several shapes and colors -- shells, parrots, palm trees, fish, etc. choices. They are great!!
The other suggestion that I followed was called the Towel Trap that slips over the towel on the back of the chair with a 2" or 3" black elastic band, and it has a colorful, fairly comfortable pillow attached to it. The website on which I ordered it slips my mind right now (oh oh ), but I'll try to find it and post it here.