Check out downtown Seattle! There are tons of places to explore, including the Space Needle, Pike Place Market, the Seattle Waterfront, and the aquarium.
Downtown Bellevue is split into two parts, Old Bellevue (with walkable streets and a beautiful park) and New Bellevue (Bellevue Square Mall and other high-end retail locations/restaurants).
Salish has both a spa and a restaurant right next to Snoqualmie Falls! Fun fact: Salish is the Great Northern Hotel in Twin Peaks.
A beautiful waterfall you can see without needing to hike. You can also hike down about a mile to see the falls from the bottom.
A cute shopping center with independent stores & restaurants housed in old mining & farming buildings.
Olde Town is the center of downtown Issaquah's Creative District, with theaters, shops, art galleries, and restaurants.
Washington has beautiful state parks with all kinds of activities, from lake recreation rentals to hiking paths of all kinds.