Take a drive South to Newport and visit Ripley's Believe It Or Not and the Oregon Coast Aquarium (http://www.aquarium.org/).
Go deep sea fishing or whale watching at near by Depoe Bay.
Go climb the stairs in the Yaquina Bay Lighthouse and then go visit the near by Coast Guard Station and check out their equipment.
Visit the Tillamook Cheese Factory and sample some cheese curds and watch the cheese making process.
Take a trip in time and go see the Evergreen Aviation Museum (http://www.sprucegoose.org/) to visit the Spruce Goose, airplane of Howard Hughes.
Visit the wine valley and sample some Oregon wines east of Lincoln City.
Visit the dunes half an hour north in Pacific city. Ride quads, dirt bikes, or any other all terrain vehicle that you can fix up with some sand tires. Also go to the Pellican Pub with locally brewed beer and great food.