If I were you I would take Hwy 2 from Glacier and not miss Coulee Dam which will be a little side trip, and Lake Chelan which will also be a bit of a side trip but well worth it, especially if you can take the ferry ride up the lake. But stay on Hwy 2 and check out Whidbey Island and from there take the ferry over to Port Townsend. That way you can buy pass Seattle and you might get to see some whales. After making the Olympic Peninsula loop until you hit the Hwy 12 sign and turn off there and go to Mt. Rainier. Hwy 12 takes you to the Paradise side.
