From Portland:

Drive west from Portland on the Sunset Highway (Hwy. 26). Just west of Hillsboro, bear left on Highway 6 towards Tillamook. Follow Highway 6 west to Tillamook. In Tillamook, turn right onto Highway 101. Follow Highway 101 north for approximately 13 miles to Twin Rocks Friends Camp, located on your right, just prior to the pedestrian bridge across the highway.

From Salem and Eugene:

Drive west from Salem on Highway 22 to its intersection with Highway 18. Turn left onto Highway 18 and travel west approximately five miles to Valley Junction. Turn right (again onto Highway 22) towards Hebo. In Hebo, turn right onto Highway 101. Follow Highway 101 north through Tillamook and Garibaldi to Twin Rocks Friends Camp, located 13 miles north of Tillamook. The camp will be located on your right just prior to the pedestrian bridge across the highway.

From Seattle:

Drive south from Seattle on Interstate 5. Take exit 36 from I-5 in Longview. Follow the signs to the Lewis and Clark Bridge. Cross the bridge heading south from Washington into Oregon. Once in Oregon, turn right (west) onto Highway 30 toward Astoria. In Astoria, take Highway 101 south. Proceed for approximately 50 miles to Rockaway Beach. Twin Rocks Friends Camp is located on the left side of the road, just south of Rockaway Beach at the pedestrian bridge.

Map to the Friends Camp