We will be staying in the Legian/Seminyak area near Double Six beach in March and want to try surfing. We are a group of 9, including 4 young teens. Is it necessary to book surf lessons in advance and what would be the going rate for adult and kid beginner lessons? Any recommended surf companies? Once we have a lesson, some of us might want to just rent a board the next day to practice. What is a fair price for a half day board rental?