Exit driveway to Ute Blvd. Turn right to Bonanza Drive. Turn left to Prospector Ave. Rail Trailhead parking lot passed the Prospector Sq. strip mall. This is the Marriott Hotel Complex.
Restrooms are available.
If you see Marriott Summit Watch words on the next overpass you have passed the stairs. Park City was a silver mining town till just a couple of decades ago to become a major site for skiing. Turn right to Park Ave. The city library on the left has restrooms open even when library is closed. Walk passed building, turn left to side entrance.