South Beach's sizzling party scene is about to undergo a massive boost in police presence and tougher crackdowns on raucous crowds and crime, weeks after a tourist eating dinner with his family was fatally shot at a Miami Beach restaurant, authorities say.

"The many years of troubling incidents in this district can no longer be tolerated," City Manager Alina Hudak said in a memo Friday disclosing plans to "create the highest level of regular police presence this area has ever seen."