Route for multi-day ride near Mt. Ranier

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I am putting together a 1-week ride with friends.  It will include circumnavigating Mt. Ranier on the route used by RAMROD.  We'll take 2 days for that route.  I am looking for suggestions on bike route extensions from there for a 1-week 350-400 mile trip.  Road bikes and hotels.  Also, route advice on getting from Seatac to this ride would be helpful.  Post here or contact me directly at kwennerberg@gmail.com