Drive downtown, walk the waterfront. Get a slice at Waterfront Pizza, and ice cream from Elevated Ice Cream.
Drive up into the Olympic National park, and visit Hurricane ridge.
A bit of a drive up a mountain and a vehicle with a bit more clearance is a good idea, 4wd rcommended.. (We did take the Prius up once during mid-summer.) Once at the top you can see the mouth of the Juan De Fuca Straight on a clear day.
Very beautiful nature center in Sequim, with a pretty bridge spanning the river.
If you have time, drive/camp the Pacific Coast side of the Olympic Peninusla. Ask us specifically for recommendations if you have the time for this adventure. All of it is gorgeous, but we do have a few favorite spots.
Fun port town to explore, with beautiful views a strong boating culture and fun quirky shops.
Your probably flying into Seattle, and I’m sure theres shit to do in the city.