Road Trip around Seattle - 3/4 days

[hellopsz]

Hello Friends,

My husband and I are going on work to Seattle from Aug 14 (this sat) to Aug 20th 2010, we have a conference to attend from Aug 17 (evening) onwards. Therefore are flying in 4 days in advance so we can explore areas around Seattle, especially since post-Aug 17th we will see a lot of Seattle city. Here is what we have in mind.

Aug 14th - Arrive in SEA and drive to Mt. Raineer (2 hours)
Aug 15th - Drive from Mt. Rainier to Portland (3 hours) early afternoon (after lunch maybe?)
Aug 16th - Portland
Aug 17th - Drive from Portland early AM to Seattle and see St. Helens on the way.

Does this make sense? Please suggest scenic routes, also places to stay.