This park I built while having a little building inspiration. I could not stand to see this empty spot located next to my sim's house, so I filled it.
Name: Little-Big Park [Couldn't think of anything better]
Size: 40x40
Required Store Items: Hidden Springs
Required Expansion Packs: Seasons [Lights, spawner, pumpkins]. Let me know if I missed anything.
This does have some base game spawners and some base game fruits and veggies scattered throughout the park. I'm not particularly good at roofing, but I did my best with the bathroom. This was inspired by SSV's Central Park. Its not flat in the pictures, but the original construction is flat.
A couple of pictures: