I just asked the chatter for a couple suggestions on what to see/do and got way more than I bargained for. I'm going to compile the suggestions here:
Cougar Hot Springs
Laurelwood Public House & Brewery
-- if you're a beer person [or a foodie], Portland has a lot to offer
-- check out the Laurelwood brewpub on Sandy
-- House of Louie has great dim sum
-- a drive up the washington coast is hard to beat
-- gorge hikes are evry easy to find
-- Beacon Rock is awesome, it's a good place to camp, too.
-- go for Beacon Rock, then, DW, it's on the washington side, it's only a mile
-- you could also go over to the coast and see Oregon Dunes, it's a bit more interactive than Crater Lake (not to dis on CL or anything)
-- Opal Creek isn't very far from Springfield. It's one of the most amazing places I've ever been.
-- I've taken a dip in Opal Pool before. Nothing quite like swimming in a pristine blue pool in the middle of a huge stand of old growth doug fir
-- You can go have lunch at the top of the Spacew Needle.
-- If you can't afford lunch just have a cup of coffee and watch the scenery go by.
-- Take pics of the homeless in Seattle.
-- if you are in Portland you will want to check out the Columbia River Gorge
-- in Seattle the Music Experience and SciFi Museum are at the base of the Needle
-- Portland has some of the best brews bar none
-- ok I will post a comment for an afternoon tour of the Gorge with photo ops
-- it is the must do trip in the Portland area
-- I'll give you the Beacon Rock hike and the Multnomah Falls hike
-- think elevation gain short hikes ;-)
-- Springfield is Eugene that is totally different
-- From there I would do Crater Lake and the Oregon Caves
-- Crater Lake is a day trip start early
-- if you can hike to the bottom I don't know if there are still boat trips out to Wizard Island but if so do that too
-- the Dunes are ok but they are not Crater Lake nothing is
-- thing is you want to be there really early or late as the lighting really makes things dramatic if you are going to take photos
-- yeah that is cool. Cougar Hot Springs is fun too
-- 4 days in Oregon... heh I have been here 30 years and there is still plenty left to do
-- I'd have to check DW nothing like the Gorge
-- plenty of those in the area DW the locals will know the best ones
-- There's lots of mountain hiking in both Oregon and Washington
-- There's hiking around the falls in the Gorge too
-- as long as it isn't fogged in
-- Oh yeah, You can pick up a hiking guide. Lotsa good stuff on the internet too.
-- Once your at the top of the falls the rest is a very easy hike
-- Yeah you can't pass up crater lake if you're down that way already
-- If you're looking for a long hike not too strenuous and you're in the Salem area, try Silver Falls