Here is my personal ranking of the places already posted in this blog. It means if I haven't talked about the place in any previous post it wouldn't appear here.
Out of Lima downtown:
1. Eco Truly Park
2. La Granja Azul
Surco:
1. Parque de la Amistad
Lince:
1. Parque Santos Dumont
San Miguel:
1. Parque de la Imaginación