Things to do with kids
Indoors
REI Flagship store
PlayDate SEA (indoor play place SLU)
Outer Space Seattle (indoor play place Alki)
Jungle Gym
South center mall
Bellevue mall
Indoor tot gyms Seattle parks & rec
Space Needle
Kraken practice arena free skate
Planetarium at Seattle Center
YMCA Kid Zone
Climbing gym -> Bouldering Project
Seattle Aquarium
Zoomazium play area inside Woodland Park Zoo
Ice skating at (Kraken Community Iceplex)[https://www.krakencommunityiceplex.com/] in Northgate or any (Sno-King)[https://www.snokingicearenas.com/] location (Renton is good)
(Southgate Roller Rink)[http://www.southgaterollerrink.com/]
Outdoors
Arboretum , South Seattle college
West Seattle Stadium bike riding and walking
Pretty much any community center playground, like Highpoint
Alki beach
Lincoln Park
Hiawatha playground/park + Good Society for beer and pizza after
Seattle Center including playground with gigantic slide
Water taxi across the sound to downtown
White Center bike playground Dick Thornau Memorial Park
Kelsey Creek Farm in Bellevue, they have farm classes for the kids too!
Schmitz preserve, walk trail down to Alki and take the bus or free water taxi shuttle bus back up the hill
Sprayparks and wading pools
Woodland Park Zoo
Sno-parks for playing in the snow and sledding, way cheaper than tubing at ski resorts
they all require a Discover Pass + Sno-park day pass
Lake Wenatchee state park sno-park is the best one, only good if staying overnight in Leavenworth because it's so far though.
Hyak sno-park is great but busiest (closest to Seattle), Lake Easton is good too and a couple exits further
Asahel Curtis sno-park
Cool parks a little bit away from West Seattle for a change of scenery
Lake Sammamish State Park
Pioneer Park in Puyallup
Carkeek Park
Dragon park Mercer Island
Volunteer Park Capitol Hill