There are so many different hiking places here, you'll just have to check out maps or their website and somehow choose one to go on! There are various levels of intensity, from a nice stroll to a few mile hike with a significant elevation gain!
Luke and I visited here on one of my trips up to Washington, it was such a fun experience! Note: It does cost money
Luke and I enjoyed a stroll through here once or twice! Lots of fun shops, and the gum wall is pretty interesting.