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Good walking and biking trail, but the unique feature of this trail is that there are prairie dogs everywhere!
The flagship institution of the state of Colorado, CU (as it's called locally) has a 600-acre campus, with beautiful gardens and buildings tucked away in its mainly pedestrian core that's worth a visit. Check out the Heritage Center located in the Old Main building, for a look at the history of CU. There are also art galleries and museums throughout campus.
CU's sports teams are among the city's best-known attractions, competing in seven men's and 10 women's sports, mostly in the Big 12 Conference. The biggest draw is the football team, which has had a rich tradition (as well as the larger-than-life personality of current head coach Deion Sanders), though it's struggled to regain its prominence. Men's basketball, and to a lesser extent women's basketball, are also significant draws. Football plays at Folsom Field; the athletics ticket office is on the first floor of the Champions Center, attached to the stadium. The basketball teams play at CU Events Center.
At the base of the Flatiron's rock formations. For a minor hike, take the trail to the 3rd Flatiron. This hike will show you sweeping vistas of town and an up-close and personal look at the Flatiron's rock formations. During the summer months, the Boulder Symphony performs at Chautauqua, with the mountains as a stunning backdrop. The Chautauqua Auditorium is a large wooden building constructed in 1898, and there is a restaurant (the Dining Hall) which was built at the same time.
Take the tour through this famous tea company. Check out the mint room, it is very intense.
A great music venue on the hill. Has been nominated for best venue in the US.
Flagstaff Mountain is a must-do. Follow Baseline Road West up the mountain, it is a windy, long road but the view is breathtaking. From up top, there is a beautiful view looking down on Boulder. The view from the other side is the Rocky Mountains. There are picnic areas, an amphitheater, bike and walking trails, Summit Nature Center, the Flagstaff House and views that you can not get anywhere else. A great place to relax or enjoy with friends.