Hin Ta and Hin Yai are natural rocks shaped by wind and water for millions of years. Strangely it is now shape like human sex organs. It is located at Lamai Beach in Koh Samui. The name means grandfather and grandmother rocks in Thai.
There are local tales which told once upon a time there were an elder couple, Ta Kang and Yai Riam which were Pak Phanang people in Nakhon Si Thammarat. They sailed the ship to ask a girl, daughter of Ta Mong Lai at Prachuap Khiri Khan, to marry with their son. When their ship sailed to Lamai Cape, the storm made the ship wrecked. Before they die, they made a wish for a symbolic to confirm they truthfully came. Their bodies on the shores transformed to Hin Ta Hin Yai.
To reach the rocks, you need to pass a short narrow alley lined on both sides with souvenir stalls selling mostly items made from coconut shells and seashells.
How to get there: Songteaws transfers between Lamai Beach and Samui Airport cost about 150 Baht per person; a private taxi charter costs around 300-400 baht. Songteaws from the ferry terminal (normally) sets you back 60 Baht.