The Turquoise Lake trail is always fun and was in great shape last month. I don’t know how familiar you are with the area, but they added several miles of new single track on Southeast side of the lake late last year. It would be easy start by the dam and do an out and back along the lake trail, then explore the new single track.
My Strava is private so a link might not work, but the pic will give you an idea of how much single track has been added. I went back over St Kevins to get back to town. This was a 31-mile 3.5 hour ride.