One of our go-to parks is actually not in Seattle. It’s in Renton, which borders south Seattle.
This is where the Sounders practice and train as well as other organizations. There’s 12 soccer fields. Other than the soccer fields, there’s a nice sized playground. I like it because it’s not usually crowded. Especially during the weekday.
There’s a pond right next to it, so you can get some nature viewing in as well.