-LA
Universal, 6flags
-Vegas
Try to get to the south ridge if u can, the west one (which is the closest to vegas is run by indians and is a bit tacky, and also a fairly shallow part of the canyon)
If you get a chance head to 'Tryst' which is a club in the Wynn. Make sure you get their early.
Hire a 300c from Thrifty at the airport branch cheap, and drive out to hoover dam
-NYC
MET, Museum of natural history, statue of liberty, Intrepid
-Florida
Head down to daytona beach to visit NASCAR
Kennedy space center
Universal is ok there, and maybe spend a day at disney world, but dont bother spending more than a day at either.