I am biased…but I think if you are in your twenties, Boulder may be a better fit for you than Colorado Springs. As I said, Colorado Springs is a wonderful place to raise a family…but I don’t have a family I want to raise currently. 
Let me tell you my typical day in Boulder. I’ll give two days as an example.
SUNDAY 5/1: Woke up at 8am. Went on a trail run in the foothills with friends. The trailheads was in Boulder! Went out for two hours and made a loop…in town! After the run, relaxed in a bagle place with some of the people I ran with for 2 hrs. Talked, had a good time. At 6:30 PM, went to another friend’s house for dinner. Four of us planned our adventures for the summer.
TUES 5/3: Went to work for 8am, got out at 4pm. Prepared for my sunset hike. Walked from my house to a trailhead less than 1/2 hr away. Some friends and I hiked to the saddle of the First Flatiron, watched the sunset over the Continental Divide while making chocalte fondue. (Seriously!)
Here’s are teaser pics from the open space in Boulder. These places are minutes from my house (by bike!):
http://gallery.backcountry.net/Co03/aas
http://gallery.backcountry.net/Co03/abc
http://gallery.backcountry.net/Co03/abe
Then there are the places 45min - 1 hr away by car!
The people of Boulder are like any other college town. You have the students, you have the granola yuppies, you have the trustafarians. You also have a a group of people who love the outdoors, will help you move and work on your house and are awesome friends.
Well, you get the idea. 
Mags