We opted to do a half day tour leaving around 11 am and retiring on the 2 pm boat. In our case this was a mistake as it did not give us enough time to visit the turtle hospital and attend the information session, walk around a bit, visit Nudey beach and have a spot of lunch. The longer treks to the lighthouse and summit, along with the snorkelling option were not for us. Still it was a great experience. The boat trip there and back was excellent and despite some chop felt safe in that the crew were competent, professional and friendly. We also had the opportunity to purchase drinks and ice creams. Suggest before booking, check what activities are on offer, the times, then make the choice of a full or half day. Definitely worth a visit.