Couple of thoughts.
What to do before camp: get in real good shape. You'll do multiple games per day and probably be sweating to death while you do them. If you're not familiar with the rules differences between FED and NCAA, get familiar with them. If you're not familiar with 3-whistle mechanics, brush up on them.
What you'll get out of it: you'll be a better official. Period. If you're (un)lucky, you'll get to hang out for a few nights with Dan.