"This has not been an easy decision for me," Ken Pringle wrote in a letter to his Belmar constituents. "There is still so much I want to do."
Pringle won't seek re-election in November after 20 years in office.
Pringle says he was not asked by Democratic Party bosses to step down because of his "tongue-in-cheek'' comments about summer visitors in 2008 -- the pre-"Jersey Shore" era.
Pringle portrayed Staten Island women as heavily hair-sprayed blondes holding drinks and called men "guidos.''
To make amends, the mayor participated in a daylong tour of Staten Island.
During his tenure in Belmar, Pringle ushered a 2001 ban on smoking on borough beaches.
He also took steps to transform the small shore community from a summer party town to a family destination.