Sightseeing
Scenic driving
Outdoor recreation
Restaurants
Bars/breweries
Wineries
Spas
Golf
Pike Place Market - Seattle's original farmer's market
Waterfront Park - Street along waterfront with attractions
Kerry Park - Park with views of Seattle, Puget Sound, Mt Rainier
Space Needle - Seattle's iconic attraction
Chihuly Garden and Glass - Gardens made of glass exhibits
Golden Gardens Park - Beachside park with views of Puget Sound
MoPOP - Museum of pop culture
Gas Works Park - Lakeside park with views of Lake Union & Seattle
Skyview Observatory - Views alternative to Space Needle
Snoqualmie Falls - Huge waterfall, viewpoint near parking lot
Maple Valley Farmers Market - Local farmers market, Saturday only
Museum of Flight - Museum about flying
Bellevue Botanical Gardens - Gardens
Lake Sammamish State Park - Park on large lake
Seattle is surrounded by three world renowned national parks. Plenty of views can be seen by car + endless opportunities for outdoor recreation activities. The park visitor centers usually provide maps and recommendations.
Take a ferry ride on the sound and spend the day in a cute town. Popular activities include: take in the views, glimpse whales, get ice cream, eat at a restaurant, tour a winery, or recreate outdoors.
Bainbridge Island - leaves out of Seattle
Whidbey Island - leaves out of Mukilteo
San Juan Islands - leaves out of Anacortes
Leavenworth, WA - bavarian-styled village in the mountains
Port Townsend, WA - charming village-by-the-sea
Lake Chelan, WA - lake town in vineyards and mountains
Winthrop, WA - old western town in the mountains
La Push, WA - rural coastline towns along ocean
Portland, OR is ~3hr drive south
Vancouver, BC is ~3hr drive north