From the Wikipedia page [1]
One of the main features of Arnos Grove is Arnos Park (44 acres or 18ha in size). Arnos Park is a remnant of the Arnos Grove estate, and was opened in 1928 after having been purchased by Southgate Council. The Pymmes Brook flows through the park, which contains diverse woodland but is mostly grassy fields. The Arnos Park Viaduct, with 34 numbered arches, carries the Piccadilly line beyond Arnos Grove Station towards Southgate Station through the western end of the park. The park contains a large playground for children as well as several tennis courts. The Pymmes Brook Trail passes through the park. Also, evidence of the abandoned New River loop can be found within the trees in the north side of the park.
The Friends of Arnos Park Facebook page is [2]