Haad Sairee, the longest and most popular beach on Koh Tao, boasts a vast stretch of sand lined with bars, restaurants, resorts, and dive centers. While the area around the beach is a major hub of activity, the beach itself doesn't get overcrowded – there's always a patch to spread your towel over. The bay can get quite busy with long tail transfers, so keep a keen ear out for boat engines while frolicking. Hawkers do walk the beach selling sarongs, tasty snacks, and fresh fruit but are not bothersome. For resort comforts, privacy without total isolation, and convenient snorkeling, head north where the coastline gets rockier but the silence makes it worthwhile.