West of Eureka on Humboldt Bay, the Samoa Dunes Recreation Area has 140 acres of open dirt bike riding. It connects with the new 75 acre Eureka Dunes about 1 mile north of Samoa.
To reach the trailhead from the intersection of US 101 and SR 255 in Eureka, head north on SR 255 across the bay. Travel 2 miles. Turn left on New Navy Base Rd. Go 4.75 miles and turn right onto Bunker Rd. Look for parking.
Overall, Samoa Dunes Recreation ORV Area is the 97th most popular dirt bike trail of all 120 dirt biking rides in California.