i don't think there's a great option, but i would love it if there were.
we go to Chuck's Hop Shop regularly - fenced outdoor seating, some games, treats, lots of other kids.
generally though, we just bring our own activities, and it's sufficient.
Depending on how comfortable you feel with the kids playing around water, the Marination at the West Seattle water taxi dock is a pretty good spot: kid-friendly food, adult drinks, beach access, easy to get to by bike or boat.
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we go to Chuck's Hop Shop regularly - fenced outdoor seating, some games, treats, lots of other kids.
generally though, we just bring our own activities, and it's sufficient.
An actual playground? Green grass? A charger for their Switch?