There are a lot of great hikes in RMNP, for the seriously fit to folks who are happy with a stroll around a crystal mountain lake. The Park is about an hour's drive west/southwest from Fort Collins. You'll probably need access to a car unless you can find a tour leaving from Ft Collins, although for the truly intrepid the distance is bikable (3+ hours on a roadbike)!
Fort Collins has one of the highest per-capita microbreweries in the USA. My favorite is New Belgium for not only great beer, but supporting the community and doing a lot of environmental work. You can go to the brewery and get a tasting for free! Plus they have tours and cool stuff for sale. Other cool breweries include Coopersmiths and O'Dells.
Moby gym is the place where we come together to worship our Lord & Savior together, to hear from fantastic speakers giving us the inspiration from God's Word to continue fighting the good fight to the end!
Be sure to stop by the new Belgium brewery, the local brew of fort collins. You get free samples and a free tour in a beautiful brewery. It is a must for traveling to fort collins. It is easy to find if you go north on Linden street from the old town district.
I have to admit that the campus of the Colorado State University is pretty nice! They are the arch-rivals of my university´s sports teams, the Wyoming Cowboys. You should try to go to Fort Collins in fall when you might have the chance to visit the annual Colorado State - Wyoming football game at Hughes Stadium. It´s called the Border War, because Fort Collins (Colorado) and Laramie (Wyoming) are neighboring cities, just on different sides of the state border. Unfortunately Colorado State was much better than Wyoming in the last couple of years. But at least we play better basketball :)
Rawah Dude and Guest Ranch is a special place 8,400 feet high in Colorado's Rocky Mountains, just south of the Wyoming border. A stunning spot in the secluded, wildlife-rich Laramie River Valley, it adjoins the 76000-acre Rawah Wilderness Area with its snowcapped peaks and 200,000+ acres of Roosevelt National Forest.
Horseback riding for all ages, hiking, scenery, the laid back beauty of Colorado's magnificent Rocky Mountains, the softly swaying alpine meadows, small, crystal creeks making their way sans effort to the valley below. I love Colorado!!!!!
If you go to Fort Collins you should take some time to go to the Rocky Mountains and do some hiking!
Whitewater rafting down the Cache La Poudre River
Nearly continuous whitewater! Take a waterproof camera and enjoy the sites also. You'll probably see a deer or two.