Directions: from downtown Apollo turn, on to Kiski Ave and follow until the road ends at a parking lot. Follow the rail trail along the river until crossing the first bridge. Immediately after crossing the bridge turn to the left and up to the second set of blue blazes (if you start following the first set you'll be riding the trail backwards which is OK but not as much fun or as easy to follow for your first time).
Continue up the hill and follow the blue blazes until they dump you back out on the rail trail. From here the trail jumps off the rail trail in to the woods in several sections until you eventually end up back where you started the loop.
There are alot of bridges, rocks to hop over and around, some log crossings, some fun dips and drops...I would say an intermediate level rider should be able to ride most of what this trail has to offer.