The Secret Art of Being a Grown-up: Tips, Tricks, and Perks No One Thought to Tell You by Bridget Watson Payne

The title is almost longer than the book, but it's a fun, graphically interesting, perky little reminder about the important things.

Wear what you want. Get outside sometimes. Ask for help when you need it. Perfectionism helps no one ... you know these things, but it's always nice to have a refresher. This would be a good gift book. Or a good addition to your personal library for those occasional "brush-ups" on the things that need reminding.