PLANO TX - Arbor Hills Nature Preserve Mountain Bike Trail - 2.2 mile loop trail - Beautiful trail in the middle of Plano. Has a concrete loop but with the option for dirt trail running. Trails are single file. There are rocks, tree roots & creek crossings. But, that all adds to the fun. The concrete trails can be busy on weekends. Separate trails for mountain bikers. Bathrooms & water fountains are located near parking lot adjacent yo a really nice playground for the little ones.