Just back from vacationing on the Olympics. While driving, I noticed that the route would be fun in an MR2.
For a possible multi-day drive, might I suggest driving south through Deception Pass to Keystone Ferry, crossing and heading west on Hwy 101 to Pt Angeles. From then on, the fun would really start.
Hwy 101 is a great drive, especially past Lake Crescent where the 2 lane road twists along the edge fo the lake for 8-10 miles. Very pretty to be sure.
Later westbound, turn north on 113 then east onto 112 back to Pt Angeles. While 113 isnt all that hot, 112 is a road with some good scenery, with a significant number of hills and turns. There are a few nice spots with viewpoints off of 112.
If it is done multi-day, then reservations at Sol Duc Resort (or a stop over) would be good as it is a hotsprings.
Then its back via Keystone or across the ferry to Victoria and again across at Swartz Bay. Two to three ferry runs gets pricey, but it is a different drive with some beautiful country along the way.
Cheers, Don