Racha Noi is an uninhabited island featuring hard coral reef and large granite boulders. The site has the best visibility in the area and offers chances to see manta rays and whales. The southern part of the island is good for divers with a bit more experience. Marine life includes huge schools of tuna and stingrays that rest on the reef amidst some excellent rock formations. Racha Noi has some of the richest coral in the area.