Horsetooth Rock sits over Fort Collins and is visible from anywhere in the city. The gap-toothed rock is aptly named. This trail leads up to the rock and gives great views of the city and flat stretch of plains that seems to go forever. Also great views of the Rockies to the west.
There is a four dollar fee for parking and entering the park. The hike is uphill most of the time. The trail is rocky at points but never that difficult. It is more strenous then maybe some people are willing to believe. Four hours round-trip for the average hiker. It is a scramble, however, once you reach the rock itself. There are also a few rock climbing lines on the rock that require pro if you like to do that sort of thing. It is an outstanding view from the rock. The lake leads way to the city and then the great nothingness that is the plains. In the summer, late afternoon showers come in and there can be some bad lightening, so it is good to hike in the mornings.
There are plenty of other trails also available in the park. The spring offers a nice variety of blooming flowers on most of the trails. This is a nice mountain park only 20 minutes away from Fort Collins.