North out of Portland on I-5 for 40 miles to Kelso exit, head west on Rt 4 to Rt. You have to return to I-5 eventually, so an alternate or return route is Rt. 30 on the Oregon side.
Long Beach is on the Pacific Ocean.
Return to I-5 and take exit 49 for the Mt. St. Helens Visitors Center . Go 15 miles north on I-5 to Winlock and head into town for a view of the World's Largest Egg . Back on I-5N, the Mima Mounds are at Exit 95, Littlerock. Marsh's Free Museum , the World's Largest Frying Pan , and the World's Longest Drivable Beach . Across the street, the Frying Pan hangs, reminding all of the annual Clam Festival.