Hidden Lakes Park Morello Ave & Chilpancingo Pkwy, Martinez, CA94553 Hidden Lakes Park is a community park located on Morello Avenue at Chilpancingo Parkway. The location offers a range…More of athletic fields as well as trails to Hidden Valley Park and around the lake. The park's features include baseball fields, a basketball court, a sand volleyball court, as well as a jogging track and a multi-use field. It also has a concession area, restroom and multiple tot play areas. Little league games are also held at the park. The picnic areas are first come first serve.