These fields are on the former Alameda Naval Air Station grounds at the west end of the Island of Alameda. Enter Alameda via the Webster Street Tube from downtown Oakland.
Follow Webster Street to the first light and turn right on Willie Stargell Avenue.
Follow Willie Stargell Ave until it becomes West Midway about mile to Lexington Street. Turn right on Lexington.
The fields are on Lexington, on your left as you approach. There is parking on the streets and also parking in the lot at the corner of W. Midway and Lexington.

This field is located at 351 Jack London Avenue, Alameda in the middle of the Bayport residential community at Ruby Bridges Elementary School. It is located between the College of Alameda and Naval Air Station, near the East Gate. Take the Webster Street Tube into the City of Alameda. (See Alameda Pt. for directions to the Tube.) Follow Webster Street to the stoplight at Appezzato Memorial Parkway (formerly named Atlantic Avenue). Turn right on Appezzato Memorial Parkway and continue approximately 700 feet to Coral Sea Street (immediately past the College of Alameda) At Coral Sea Street, make a right turn and proceed approximately one block to Jack London Avenue. Make a left turn onto Jack London Avenue. Proceed approximately 1/2 block. The field will be on your right side. Parking is immediately adjacent to the field.

https://www.google.com/maps/place/Beach+Play+Field/@37.8225276,-122.2456379,15z/data=!4m2!3m1!1s0x0:0xf2176012c14e79e4?sa=X&ved=0ahUKEwidkavir-LOAhXElZQKHZhBCM4Q_BIIcjAK

This field is on Bay Farm Island in Alameda. From the High Street Bridge entrance to Alameda, follow High Street about one mile to Otis Drive. Turn left on Otis Drive and follow it across the bridge onto Bay Farm Island. Turn right onto Island Drive and left onto Maitland Drive. Follow Maitland to Melrose Avenue. Turn left on Melrose and follow it one block to the field.

From I-80, take the Gilman Street exit.
Go east on Gilman until it ends at Hopkins.
Turn left & go 5 blocks.
The field (with the track circling it) is on the right.