Nice twisty and technical single track with some jeep roads, situated across the Snoqualmie river from the small farming town of Carnation, WA. Follow the signs to the John MacDonald park and after unloading the bike head across the suspension bridge (be sure to walk the bike) to the trails. Once across the bridge, head straight up the hill and into the woods. The steep 1 mile climb to the top will give you a REALLY nice warm up. At the top are some jeep roads and a whole bunch of single track snaking through the dense woods. Best to go in with someone that is familiar with the trails as it is very easy to lose your bearings even with a map.
Park entrance is at NE 40th St and Highway 203 at the south end of Carnation. Day-use and overnight parking (for those with camping sites on the west side of the river) is available. West side of park is accessed by suspension bridge. No motorized vehicle access allowed, other than service vehicles.
http://www.singletracks.com/item.php?c=1&i=1013