[You Need a Thneed]

On the way up take the 101 along the coast, and not the I5. The 101 has vast lengths of beautiful scenery.

Around Crescent City, there are Redwoods - so awesome. This is as far south as we drove in 2006. We came down the 199 from Grant's pass, and the trees just keep getting bigger and bigger as you approach Crescent city.

Didn't go myself, but around Coos Bay, you can rent quads and drive on sand dunes.

Newport, OR was a nice little town.

Just east of Portland is Multnomah Falls, a little commercialized, but a nice hike up. Other, smaller falls closeby that have nice hikes as well. EDIT: with a 7 month pregnant wife, you won't be able to do the hike to the top. You still could go see it from the bottom.

Mt St Helens - on Hwy 504, it's about an hour off of the I5, another hour back, as there isn't any exit towards spokane. Another gorgeous drive.

The I90 between the mountains and Spokane is a pretty boring drive - though the columbia river valley is pretty impressive there, and looks totally different then the columbia river valley by Portland. One place is a desert, one place is a rainforest.

We took my 1999.5 Jetta down, blew a water pump the evening we got to Crescent City (which of course was a Saturday). I had to wait until Monday for an auto service shop to open up, and then they had to order the water pump to get there the next day. It was a little unnerving staying in our hotel was was on the edge of the ocean, reading about how a Tsunami devastated the town in the 60s, and us having no car to use in case there was a Tsunami warning again.