Starting from west end (YMCA or 183A Trailhead), I like to drop in at Dave's Ditch / Glitch off the BCRT and take the first sharp left up that connects to Rim. Stay to the right at the top and ride through a couple of g-outs before looping back in the opposite direction to stay on Rim. Follow Rim to the end, and take the climb on the right, which is the beginning of Up-and-Over, which leads to Deception (Double Down). Ride that first section of DD W-to-E until you hit the Picnic Bailout. Bail to your left to jump on PicnicX, and go right at the first fork. Follow Picnic X all the way to Picnic, and then stay to the right to follow Upper Picnic. Stay on Upper Picnic and either follow it all the way to the end or you can choose from a number of drops on your left and then follow the rest of Lower Picnic to the end at BCRT.
At this point, depending on how much you're wanting to ride, you can follow the BCRT to hit Mulligan, Peddler's Pass, and the Candyland section of trails. When you're ready to head back east, enter Deception (1/4 Notch) at the easternmost end and follow it all the way to the end (1/4 Notch turns into Double Down at the Swag bail). You'll now be back on the jeep road that separates Deception from Up-and-Over, and you will have ridden the westernmost section of Double Down in both directions. Now take Up-and-Over back to Rim and ride it in the opposite direction from where you started. When you get to the end of Rim though, climb up the hill to your left and loop back around into the very top of Dave's Ditch, where there is a really fun swooping descent. Caution here though that if it's wet and slimy, it can be very dangerous. You'll end up coming out of the ditch back at the BCRT where you started.
Now if you still have something left in the tank, head over to any number of ascents up to the ridge sitting behind the YMCA. At the top, to the right of the cement drainage ditch that is near the 183A trailhead, you'll find the Snail Trails that are great fun with a few challenges mixed in. Just riding the Rim, Deception, Picnic loop that I described will give you 1.5 to 2.5 hours of riding depending on your fitness and abilities. Adding in any combination of the other stuff can give you another 1.5 to 2.5 hours, depending on various factors, such as how many laps of goodness you choose to consume at Peddler's Pass.