In Federal Way there is a rhodendeum garden. lots of other wild flowers, beautifully maintained.
Take a Ferry boat ride.
Lots of good restaurants & good shopping downtown.
Plan on a full day at Pikes Market, so much to see.
Take a heavy sweater, gets chilly even in June.
Fabric Depot is in Portland Oregan, Nice drive, may be an overnight jaunt. Mt St Helens between Seattle & Portland. Also Mt Rainer is beautiful Park, but a long drive from Seattle.
Have fun