We're planning a last-minute trip to Colorado in 3 weeks, 5 days, staying in a VRBO in Winter Park.
We have a 2 and 4 year old.

Any must-do's? Tips or must-brings?
DH and I have never been to the mountains so don't really know what to expect!
We hope to spend one day in Rocky Mountain National Park, and one day at Winter Park Resort, but are open for the rest of our vacation.