There were lots of places in the USA that (as a Canadian) my family and friends loved visiting - Kauai for hiking and beaches, Mt. Baker for skiing, bay area for all the weird stuff that goes on there, Nevada for that thing in the desert, Oregon coast for surfing, Utah-area parks like you said, hiking in Washington.

Lots of amazing outdoor adventures to be had in the USA. Now days I don't know anyone that goes to the states.