Did you have any particular part of Colorado in mind? It's a big state. Lots of visitors like to stay near the Denver - Front Range Area or up on top of the mountains.
I live in the far western part of the state, close to Utah. There is a lot of wide open spaces over here and not as many people. I've ridden or driven many of the roads in the northwestern and southwestern part of the state. If you are thinking of coming to this part of the state I could suggest some good places to visit.
Does your child like dinosaurs? There are places around here to see dinosaur bones, tracks and quarries.
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