My favorite trick lately when I've HAD to go out into the heat, is to get a bandanna, wet it, and tie it around my wrist. (or both wrists if I have two bandannas)

There's something about having a cold, soggy bandanna on my wrist that makes the rest of my body feel cooler.

and if you have a third bandanna, you can wet it and put it across the back of your neck.

Last time I went to the zoo I forgot my bandannas. It wasnt that warm outside (it was early April) but I was really dragging. (was just about to start the big flare that's been harassing me all summer) I think I would have felt better if I'd had my soggy bandannas with me.

Last summer, that was pretty much the only way I could get thru the zoo was to have those bandannas and also to stop at the snack bars and get frozen lemonade (Mmmm!) They also had a few exhibits that are kept cold for the animals, gotta love the penguin display in the aquarium...I like walking thru that display. They have benches where you can sit and watch the penguins swim and eat fish if the handlers are there tossing food to them.