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If you're keen on spotting sea turtles, a strong option place to start is at the Coral Island (Koh Hae). This area is known for its crystal-clear waters, making it easier to see these magnificent creatures while snorkeling.
• Another great spot is the Similan Islands, part of a national park that's famous for its rich marine life. While it's a bit of a trip from Phuket, many tours are available that take you there for a day of diving or snorkeling.
• If you're interested in conservation efforts, check out the Phuket Marine Biological Center. They sometimes have programs where you can learn about sea turtles and even participate in releasing baby turtles into the ocean.
Check age, height, fitness and supervision requirements before paying. Build in shade, water and rest time, and avoid overloading a family day with long cross-island transfers.