Holbox is generally considered one of the safest destinations in Mexico. The island is small, the community is tight-knit, and the local economy depends entirely on respectful tourism. Crime is extremely low. Solo travelers, women, LGBT+ couples, and families with children all feel comfortable here.
Natural hazards to know: Jellyfish (lion's mane and Portuguese man-o'-war) can be present in the water from June to September — check local conditions before swimming. The Caribbean sun is intense: use mineral sunscreen (not chemical, to protect the reef). Hurricane season runs June–November, with September–October carrying the most risk.
Whale shark regulations: Touching whale sharks is prohibited, flash photography and drones are banned, and the number of swimmers per whale shark is strictly limited. Always follow your guide's instructions to protect these animals and your own safety.