Officially called the Olympic Discovery Trail Adventure Route, locals call this point-to-point trail the OAT. It's a 25-mile point-to-point singletrack trail from Hwy 112 to Lake Crescent featuring long inclines and descents along the way. The first 3.5 miles are mostly uphill until the Living Room, where you're rewarded with a stout wooden bench and great views of the Bailey Range to the south.
From the Living Room, continue west for more rolling hills and switchbacks, deep mossy forest, and views of the Strait of Juan de Fuca and Vancouver Island, Canada, to the north. Around MP20, you'll cross a paved road, the Joyce-Piedmont road. At MP 21 you hit a gravel logging road; take a right, follow it all the way to the bottom of the hill, then turn left and continue on to Lake Crescent.
PARKING: The main eastern trailhead is next to the small parking turnout on Hwy 112 near the Elwha River, about 15 minutes west of Port Angeles. More parking (and portapotty) is available nearby off Dan Kelly Road (watch for the sign saying Olympic Discovery Trail/Adventure Route Equestrian Parking). Small parking area at MP 20, Joyce-Piedmont road.