6. Isla Holbox – Mexico

Isla Holbox offers a relaxed Caribbean vibe minus the crowds. Its waters are warm, shallow, and crystal-clear, perfect for lazy swims or spotting colorful marine life. The island bans cars, preserving its slow-paced charm. Visit during the right season, and you might even witness the magical bioluminescence lighting up the waves at night. Holbox is the perfect hideaway if you crave clear waters paired with a chilled-out, barefoot atmosphere.