Run your wrists and other pulse points under icy cold water. Repeatedly cooling off the wrists will also cool off the body. Some research suggests that this will reduce your core body temperature by as much as 3 °F (1.5 ºC).
Drink lots, and we mean lots, of ice cold drinks. Water is best. Avoid sugary drinks – yes, even iced tea – unless it is unsweetened.
Put a wet towel on the back of your neck and also the top of your head. This works!
Have a cold shower or bath. Even a tiny bit of water splashed on can help.
Soak a t-shirt, wring it out, put it on and sit in front of a fan.