Years ago when the kids were babies, we often brought them to this park in Sin el Fil. It's cute, well cared for, small, and free.
There is a small assortment of play equipment, a sand box, lots of greenery and benches.
At the front gate, rules are posted. No pets, no food, no balls, don't step on the grass, and possibly a few others. Clearly, the rules aren't strictly enforced, per my opening picture. I'm glad they're not.
Here's a map if you want to visit the park. The red circle indicates the park, with the arrow identifying the entrance.