For Mt Rainier take the road to Paradise lodge. You can eat lunch right at the base of the Mountain. A great day trip.
For everything on the Oly Pen, take Hy 16 over the Narrows Bridge (if you're not afraid of Hights
). There is another way but not nearly as scenic. Take the turnoff to Shelton, this will put you on the West side of Hood Canal, you won't be sorry. Hope you enjoy our State.