You can click points that you want to go to and get your route between those points. Once you have created your route, you can view it in Google Earth, Download the Route to your GPS or print a map of your route with turn by turn directions - including the roads and trails.
Each year, the Mountain Trails Foundation produces a high quality map of the trails in the Snyderville Basin in and around Park City, UT. This map is quite popular and now is available in interactive form right here.
Any user can browse, search and even create your own custom trail routes. You can plan a ride or hike, map it out on the interactive map, and then head outside with turn by turn directions and even upload the route to your GPS. You can download the route to Google Earth for 3D visualization as well.