We will be in Oregon for 5 days, Im wondering what are the must see's. We are going to a sandcastle building contest on the coast our first day there and wanted to head south from Lincoln city. I would like to see waterfalls, covered bridges. Of course the coast, hopefully seeing dolphins and whales and sea lions. Is Mt St Helens in Washington a must see? Any other ideas of things I really need to see while in Oregon. It is probably my once in a lifetime trip. We are coming from Michigan.