Pi Leh Bay, a stunning natural lagoon on Koh Phi Phi Leh, Thailand, is renowned for its tranquil emerald waters encircled by towering limestone cliffs, offering an idyllic spot for swimming and snorkeling. Accessible only by boat, visitors typically reach it via longtail boat or speedboat tours departing from Phi Phi Don, Phuket, or Krabi. While private boat charters offer flexibility for solo travelers or small groups, most opt for guided island-hopping tours which are often more cost-effective and convenient. The best time to visit is during the dry season (November to April) when seas are calm, though the sheltered bay can be enjoyed even during lighter monsoon periods; always check local sea conditions. A visit to the bay usually lasts 30 minutes to 1.5 hours as part of a longer half-day or full-day tour, costing approximately 500-3000 THB per person depending on the tour's origin and inclusions (private charters are more, around 1500-3000 THB for a few hours). Useful tips include visiting in the early morning for fewer crowds and optimal light, bringing your own snorkel gear, sunscreen, and a waterproof camera, as there are no facilities within the pristine lagoon.