Alameda is an island, and as such it's difficult to get truly lost if you have your basic bearings. The island is bordered on the north by the Oakland estuary and to the south by the San Francisco bay. The west end of the island is taken up by the now closed Alameda Naval Air Station. At the south end, you'll find a bridge to Bay Farm Island.
Major north/south streets:
Webster St.
Grand St.
Park St.
High St.
Major east/west streets:
Lincoln Ave.
Santa Clara Ave.
Central Ave.
Encinal Ave.
Otis Dr.