Southern California’s beach-themed specialty burger chain Islands is breaking into the Bay Area market with a new outpost that opened in Cupertino on Tuesday. The new Islands restaurant located at 20750 Stevens Creek Blvd. in the Crossroads Shopping Center will join other Northern California locations in Roseville and Monterey. The Carlsbad-based chain, in business since 1982, has 50 locations on the West Coast, but Cupertino beat out bigger local competitors like San Francisco and San Jose for…