Colorado is filled with different pockets of intriguing areas throughout.
Sure there are the Rockies, but also drier canyon and desert regions (such as the Colorado Plateau, which extends into the desert southwest) in the spring and fall are an excellent option. It’s in a class of its own, really. A few tips:
-I believe there are 43(!) Wilderness areas in Colorado. I’m a big Wilderness area enthusiast and find that if you enjoy escaping the crowds, they are money. The farther you get away from the Front Range and (of course) do a little off-trail exploring, the more you will find solitude.
-If you dislike crowds, you’re most likely going to dislike the 14er peak-bagging culture we have out here. If you don’t mind people asking regularly how much further to the top and walking amongst many ill-prepared day hikers and tourists, then you may however enjoy them.
-Check out the Colorado Trail if you don’t mind some crowds, but an extremely well maintained trail system. You can find maps and guide books by checking out the Colorado Trail Foundations website. They’re a great organization. Like I mentioned above, the farther you get away from the Front Range, the less people you’ll see.
-As for maps … check out National Geographic’s Trails Illustrated series. They have a total of 50 maps that they print for the entire state. Also by googling “Colorado Hunting Atlas”, you have access to all USGS and satellite images throughout Colorado. There is an option to print :)
-You may also consider becoming a member of the Colorado Mountain Club, and while you’re at their website, I would check out “CMC Press” where you can find a wide variety of guidebooks.