Olympic National Park is three parks in one: glaciated mountains, temperate rain forest, and 70 miles of wild coastline. No road crosses the middle, so you see it the way everyone does — by looping around it on US-101. From Seattle it's about 450 miles with the detours, starting with a ferry across Puget Sound and ending on the long drive home past Lake Quinault.
Four days lets you catch each of the park's worlds at its best: Hurricane Ridge in the evening light, the Hoh Rain Forest before the crowds, and the sea stacks of Rialto and Ruby Beach at low tide. Here's the loop, the stops, and the plan. Let Wanderply build your version around your dates — tide times included — and narrate every stop for the drive.