Why should you go there and how do you do it right?

Haad Sai Daeng, meaning "Red Sand Beach," is one of Koh Tao's quieter beaches, tucked away on the island's east coast. Unlike the busier beaches to the west, it offers a more relaxed atmosphere with calm, clear waters and distinctive reddish sand that sets it apart from typical tropical beaches. The surrounding coral reef makes it a popular snorkeling spot, allowing visitors to observe marine life in the relatively shallow waters close to shore.

Visitors can expect a relaxed atmosphere with fewer crowds than on Koh Tao's main beaches – ideal for those seeking a peaceful day. The beach is rather small, which contributes to its laid-back ambiance. The sheltered bay typically offers gentle waves, making it suitable for both casual swimmers and snorkelers. While some basic amenities are available nearby, the beach has retained its natural, unspoiled character.

The calmest and clearest water conditions at Haad Sai Daeng are generally found during the dry season in the Gulf of Koh Tao, roughly from February to September. The sea is roughest from October to December, which coincides with Koh Tao's heaviest rainfall. Access is usually via a short ride from the main pier in Mae Haad, either by taxi, motorbike, or organized transport. Visitors wishing to snorkel should bring their own equipment, as rental options in this part of the island can be limited compared to the busier beach areas.