If you stay up too late, you'll be sleepy the next morning. A lot of girls are fantastic athletes. A lot of boys are good at artsy things. Don't run with scissors, near tent stakes, around the pool or on a wet bathroom floor. Short hair dries faster.
Talent shows are full of surprises.
Don't step on bugs in your bare feet. You can't make everyone happy, but that doesn't mean you should stop trying. Clean up after yourself. Be thankful for the food you are given. When you are really hungry, you will eat anything.