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I was glad to see you dump the "visiting with relatives" out of your itinerary. You are going with two 12-year-olds. Not high on their list. One wet blanket to throw on your well-planned party: Visiting Little Big Horn. If I made my grandgirls visit the battlefield I would no longer be their favorite grandfather! Unless there is a particular interest or a family tie-in, safe your money. Been there, done that!
Uh, touring RMNP after setting up camp after 2 PM and then heading out? You will barely have time to get to the entrance gates.
As a number of members mentioned, relax a little, don't be afraid of dropping one or two destinations, and make sure the girls have the time of their lives. You and Momma have a lifetime to make these trips on your own.