After the 2 mile journey out to the start of the main trails take Loch Ness, Upper Loch Ness, turn right after exiting Upper Loch Ness and right again just past the creek running under the 2 track. Follow this and you are on Lower West Meadow and stay right to follow around into Inner Loch Ness. Exit there to the left and ride up to Vista Ridge, West Meadow/Upper West Meadow and Randy's Trail. Follow Randy's trail and exit to the right into Lower Spider Berm exiting there with a hard left on Upper Spider Berm and exit straight to the 2 track and right follow the open Single Track into Gator Pit and follow it around into Golf Cart.
This much may give you a good workout if you haven't been on the bike in the woods in a while. AT this point you are about 4+ miles from the parking lot on the shortest route.
If you have more game left in you exit Golf Cart to the left and follow it around to Mt. Boyette; just a little climb.
At the top of Mt. B turn right and enter CANYON. A tricky little switchback turn in there - let us know how you did. Exit Canyon and catch your breath, have a GU and enter North Abyss. Just follow the single track cut in the grass to South Abyss and keep following it, even on the 2 track, until you have done Big Drop and exited back at the exit of Canyon. If you handled these trails so far and have more in you then you can tackle Pandemonium, Sidewinder, SWAMP Thing, and......Ridgeline! Ridgeline will kick your ass if your endurance isn't up, and some pretty hefty short ups and downs. Okay, so a couple of the hard option downs are pucker material your first time or two.
Or you can save that for a nother day and find your way back to parking after the Abyss's. Download a map too.