The States like Caz, travel around as much as possible, do a road trip and take in a trip to Canada to go whale watching and skiing, a trip to see the Lakes and Niagara Falls. Would also have to fit in swimming with dolphins. A few days in Mexico would be great too.
Going back to San Francisco would be a must and Route 66 in a classic car, New York too and to meet up with a friend who lives there who I've not seen since uni days.
A helicoper ride over the Grand Canyon, a stay at a ranch to go riding with cowboys. Mardi Gras in New Orleans. A few days in Miami and Hawaii too.
I'd also visit the families I stayed with when I was there as a youngster in LA and Clovis.
Am I being a bit ambitious :)