Feeling more like spring than winter today and I'm still having fun with maps.
This is a mountain bike course but it can be XC skied or run, if you like. It's 7-1/4 miles long and a little over 800' vert for the loop. The trail is situated at Harriet Hollister Spencer Recreation Area near Honeoye, NY and is about 90% singletrack. The remaining is on double track ski trails which are groomed in the winter. The course was constructed for the annual "Suicide 6" cross-country mountain bike endurance race, which as you might guess, is a 6 hour endurance race. For that reason, the track is often burned in quite well and usually easy to follow. There are limited trail markers around the course but it helps to know where you are going. If interested, I can provide the GPS trace that I used to make this map.
The course is mostly natural singletrack with very few man-made features, but is still a good ride. It's moderately technical, intermediate skill and fitness to negotiate. The trail is very rocky and rooty, and a full suspension bike isn't a bad idea, although it can easily be ridden on a hardtail. Parts of the trail have decent flow, but there is a fair deal of pedaling to maintain a respectable pace. Climbs are pretty manageable and mostly have moderate grades.
The course is spread out over about 600 acres or so, and isn't heavily trafficked except for race day, so despite cars at the trailhead, you'll unlikely run into many other riders.
The trail can be ridden in either direction, but I definitely recommend riding it counter-clockwise the first time. This is the way the race is run and the way it is meant to be ridden. It's considerably harder going clockwise, particularly the climbs which are steep and punchy in sections.
The trail system is built and maintained by WYNMBA and some information can be found on their website, but perhaps not very up-to-date.