Tip for life #1 - Don't push yourself too hard! This can be tested during your rest breaks by timing how long it takes your breathing to return to normal. A healthy person's breathing returns to normal in about 3 minutes.
Tip for life #2 - DRINK WATER!!!! for some reason, that needs repeating, DRINK WATER!!!!. If you feel thirsty, you are already dehydrated.
Tip for life #3 - Go swimming during lunch breaks if at all possible. This is not only fun, it also cools you down in a big hurry. also/instead wash you shirt, hat (pants if you chose). Not only wash them. Wash them, set them out to dry, then dunk them again just before you put them on (before you leave) This will keep you really cool.