I'd advise not staying at the Jellystone Park in Larkspur, South of Denver in Larkspur, unless you like trains, and noise from the interstate. There are train tracks that border the park, and next to them is I-25. Trains all hours of the day & night going slow enough that once (we work camped there one summer) I saw a butterfly going faster than the train!!! There are several campgrounds in the Colorado Springs area if you want to be a little way out of Denver.