Watch out for jellyfish, especially at dusk. Places that are totally harmless during the day are suddenly home to jellyfish sporting massive tentacles (3m long tentacles, in fact, courtesy of the blue jellyfish) that whip you and leave you oozing black poison from painful lumps. Ultimately they don’t do any damage but travel with antihistamine and avoid swimming at sunset, no matter how romantic it might seem at the time. The tiny red jellyfish that float about during the day do little more than give you a weird electric-shock sensation.

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