More of a pyramidical rock than an island. Koh Chang Noi lies off the eastern tip of Koh Mai See Yai. No possibilities to stop on the island but it seems to be a popular spot for local fishermen. Not sheltered at all so unlikely to be good for snorkelling.
Worth Visiting? No. But you will go right past it if you decide to visit the fishing communities on Koh Mai See Yai.