SUP Location Guides - Castor & Mairangi Bays, Auckland Posted by StarboardNZ Admin · June 26, 2019 Castor and Mairangi Bays are among the many lovely beaches on Auckland's North Shore for standup paddleboarding. Read more 0 comments Tags: Castor Bay fitness Mairangi Bay North Shore Paddleboarding standup paddleboarding SUP SUP Guide SUP locations SUPWell where to SUP