Make sure you bring a hat, some sunscreen and bug repellent and some water. If you have binoculars with you, make sure you bring them, you will be happy you did! A bathing suit, in case you decide to jump in the water for a refreshing dip is also a good idea. It is also a good idea to bring some cash even if you have pre paid your tour, since lunch is not included and you might want to get a bite at the end of the tour.