<P> In 1920 , the Miami Beach land boom began . South Beach 's main streets ( 5th Street , Alton Road , Collins Avenue , Washington Avenue , and Ocean Drive ) were all suitable for automobile traffic . The population was growing in the 1920s , and several millionaires such as Harvey Firestone , J.C. Penney , Harry C. Stutz , Albert Champion , Frank Seiberling , and Rockwell LaGorce built homes on Miami Beach . President Warren G. Harding stayed at the Flamingo Hotel during this time , increasing interest in the area . </P>
what is the main street in south beach miami
5th Street Alton Road Collins Avenue Washington Avenue Ocean Drive