Break out your costume and head to Waikiki. Royal Hawaiian Center is home to Halloween activities, including a costume contest 3 to 5:30 p.m. Oct. 28. Prizes for those deemed most adorable, most creative, most original, best ohana, and grand champion with winners receiving shopping center gift cards. Three-hour parking validation provided for registered participants. Not feeling competitive? There will be balloon twisting and trick or treating from 2-7 p.m. Visit RoyalHawaiianCenter.com/