If someone is coming in from out of town for the day, but you don’t want to bring them to your apartment/house, where are some fun/relaxed places you might take them to hang out this Labor day weekend?

Relatively new friend coming to Seattle from Bellingham to spend the day. I live in Interbay, and am looking for an itinerary for day. Any suggestions would be greatly appreciated, as I’m trying to fill the day, but not be too high maintenance. (This sort of stuff makes me unnecessarily nervous/anxious.)