We did one of our BEST vacations last year – 3 weeks total, Glacier Nat’l park, Yellowstone, Grand Teton. We luxed it up by staying in cabins in the park – vs camping… but there were no tv’s… no wifi… kids mastered life skills like skipping rocks on a lake, watching ant trails, etc.
Swimming was in lakes (brrr)… but they didn’t seem to mind.
My kids are older though – at the time they were 9 and 11.