Grandfather and Grandmother Rocks, also known as Hin Ta Hin Yai, are unique rock formations on Koh Samui's south coast that resemble male and female genitalia. Locals discovered these rocks years ago, and they have become a popular attraction on the island. Visitors can easily access the site between Lamai and Hua Thanon, where they can explore the rocky coastline and hear local tales about the formation of these intriguing rocks. Don't miss the chance to check out these natural wonders and snap some fun photos!