I would love to do the Inca Trail some day, we were a little pushed for time and also we had the munchkins with us so we got the train from Cuzco which btw I loved as well. I guess quite a lot depends on how you adjust to the altitude but if you're going up through Bolivian first I guess you'll be ok - also drink the coca tea. ;)

Taquile island by any chance? make sure to see the totora islands as well while you're there...

Costa Rica, Mexico, the Galapagos & Honduras are still on my 'to visit' list ;p

Yay pics!