Aberdeen Square, located in the southwest quadrant's 19th Ward neighborhood, is a large grassy open space, commonly used as a field for soccer or football, as a gathering spot for neighborhood games, and local school activities. It also plays host to events staged by the 19th Ward Community Association.
Founded in 1965, the 19th Ward Community Association is a registered not-for-profit organization that strives to maintain the residential atmosphere of Rochester's largest neighborhood. One of the oldest continuously active neighborhood groups in the country, it works closely with City Hall and the Monroe County legislature to focus the commercial and residential development efforts with an emphasis on maintaining the neighborhood's diverse range of socio-economic groups and residential urban atmosphere. The Association holds their annual Square Fair at Aberdeen Square Park each Spring and sponsors the Westside Farmers Market each Summer.
This cache is a micro, which blends in well with the local greenery. As it is too small to hold an FTF prize, the FTF gets bragging rights, and a nice walk in the park. Good luck!
Sources:
http://www.cityofrochester.gov/article.aspx?id=8589935101
http://rocwiki.org/Aberdeen_Square_Park
http://rocwiki.org/19th_Ward_Community_Association