C.Y.
In the Colorado Springs area there is 7 Falls, Cave of the Winds, and Santa's workshop. Those are good outings but they cost and I don't know how much.
My favorite daytrip is to pack a picnic lunch (and plenty of water) and go down to the Springs to Garden of the gods. At one entrance to the park there are big rock formations that they can play on. Just off of the main parking area (which is not at an entrance) there are restrooms. And there is plenty of trail space for hiking and goofing around. Totally free. www.gardenofthegods.com