It is Belleview Park. The cross streets (for parking) are Inca and Belleview. No sure where you are coming from so I'll give 2 sets of directions.
From Santa Fe & Belleview, go east on Belleview. You'll pass Pirate's Cove (on your left) and head down a hill. Just as you begin to go back up a hill, turn left onto Inca and take the first left into the Parking Lot. Playground is right in front of you and train & zoo are down the hill (there are stairs).
From Broadway & Belleview, go west on Belleview. You'll pass KMART on the left and then head down a hill. Almost to the bottom of the hill is Inca. (The streets are in alphabetical order here so once you pass "H"uron, it's the next street.) Turn right and take the first left into the Parking Lot. Playground is right in front of you and train & zoo are down the hill (there are stairs).
There is also a creek running through the park in which children love to play. Tunnels running along the creek go under Belleview and take you (walking) over to Progress Park which is mostly green ballfields but also has a play area.