We really enjoy taking the O2-Cool Carabiner Water Misting Fans. They're really small so they don't interfere when on the rides, use water to mist, run on one battery and have a clip to attach it to your belt loop. I can't find them in Canada so I just bought a couple more from the following U.S. camping store. Shipping was a flat $12 to Canada so I ordered a couple for our friends. They're only $5.99 each.
Here's the link to
Campmor.