We confirmed 24 hours in advance. They picked us up on time at the Hilton Hawiian Village. The driver was friendly and informative. We were quick at getting fitted into the snorkel gear. The regular gear is just fine. Lot's of extras at the shop. Due to the delays getting into the park I would suggest a later pickup ( which they offered!) Take snacks and water as the concession is at the top of the hill. Fabulous snorkeling for our whole group of 10 ( ages 11 - 65) They easily handled all of us and were very efficient! Great experience with Viator and the Hanauma Bay Snorkel shop! There is no way I would take a bus and try and do it ourselves. The best $20/ person spent our whole vacation! - Rob ( Canada)