Round Valley Rail Trail is a 5.9 mile loop trail located near Park City, UT. The trail is good for all skill levels offers a number of activity options.
Nice mix of single track and also wider fire roads. Rolling trails with some uphill, down, and level sections. Mostly high desert, some parts through trees. Lots of variety in the area. Good for beginner to intermediates, kids ok if have some experience mtn biking
A slightly longer and better variant is Rambler to La Dea Duh to Matt's Flat.
Lots of options to create cross country loops. Good trails for beginner and intermediate riders.
Great beginner trails. Double track and single track.