Red Rocks for a concert, or just for an easy hike.
www.redrocksonline.com
The boys might like Dinosaur Ridge.
America’s #1 dinosaur tracksite is a short drive from Denver where you can see and touch fossils in the mountainside. Plan your visit today!
dinoridge.org
Glenwood Caverns Adventure Park. Get there early to avoid lines for the rides. Save the cave tours for mid day when it gets hot out.
Experience the thrill of Glenwood Caverns Adventure Park. Explore underground caverns, ride thrilling roller coasters, and enjoy stunning mountain views.
www.glenwoodcaverns.com
Great Sand Dunes NP
The tallest dunes in North America are the centerpiece in a diverse landscape of grasslands, wetlands, forests, alpine lakes, and tundra. Stay on a moonless night to experience countless stars in this International Dark Sky Park!<br /><br />Open 24 hours a day, 7 days a week year-round. <br...
www.nps.gov
Maybe look at a fishing charter on a reservoir up in the mountains.
Or book a horseback ride.
Find a swimming hole. Some bodies of water in CO do not allow body contact. If your not sure, check the regs or risk a ticket.
I haven't been there, but Guffey Gorge/Paradise Cove looks pretty cool and is near Pikes Peak.
Get ready for summer with amazing watering holes and swimming spots in Colorado. Say goodbye to snow! You don't need to travel far to get your tan on.
303magazine.com