It's really important that you be aware of the heat. You need plenty of liquids to function at your best and to avoid dehydration. Make sure you drink lots of water and/or sports drinks. In the heat of the day, you should be drinking regularly whether you feel thirsty or not. Some have argued that by the time you actually feel thirsty, you're already at least slightly dehydrated!
Coffee, beer, and soft drinks with caffeine won't help you stay hydrated. To avoid dehydration, make sure you're drinking plenty of water or sports drinks like Gatorade.
If you're walking about in the heat of the day, stay in the shade if possible. Given a choice, choose the shady side of the street to walk down. The shade of a nice palm tree is almost always a delight.
Should you become dizzy, get the shivers from profuse sweating, or just feel sick from the heat, get out of the sun, cool off, and rehydrate!
The term SPF on a bottle of sunscreen lotion stands for “sun protection factor.” An SPF of 15 means that the sunscreen provides about fifteen times the amount of protection of your own body's unprotected skin. As opposed to a sunscreen, a sunblock aims to completely protect you from the sun's damaging rays.