Just a couple of hints :
1. If you hang around the front of the house waiting for the truck your family will find things for you to do. Be subtle.
2. Many people inexplicably become sick on the day their speakers are scheduled to arrive and are not able to go into work. Don't let this happen to you.
3. Figure out the first few things you are going to play BEFORE all the boxes arrive.
4. Remember you can't buy cables and wire at 2 AM; even if YOU are excited about hearing your new speakers. Double check now
EDIT -- and, of course, congrats on the new system. You're going to enjoy it. How big is your room, btw ?