Hey, I walked the freedom trail last year.
Anyway, my list:
See the Alamo
Hike the Grand Canyon
Walk across the Golden Gate
Watch Old Faithful
Wade in the Pacific
Wade in the Atlantic
Wade in the Gulf of Mexico (with shoes on...it's yucky)
The Strip in Vegas
Mardi Gras
Disney World
My list of stuff I still need to do, off the top of my head:
Empire State Bldg.
Statue of Liberty (it's reopening)
Washington D.C.
I'm too tired to think of anymore