Yesterday I was using a wool/cotton blend yarn. I didn't find it to get sticky as long as I kept my hands cool and dry. I used an aluminum hook with a clay handle, which seemed to work well. I can always wash off the clay handle if necessary. It didn't get too hot in my hand like bare aluminum might have.
As Sara commented, she's right, you can't crochet by the pool if you have little ones. This is the first year I have really been able to crochet with the kids at the pool. I can crochet and look up frequently. I still don't feel comfortable reading by the pool if I need to watch the kids at the same time.
Anyone else have "crochet by the pool" tricks to share? I'd love to hear them!