Apart from the usual Mediterranean nuisance of gnats and mosquitoes, there isn’t much to worry about in the way of health hazards. When going out into the hot sun, ensure that adequate sunscreen is applied and only loose cotton clothing is worn. In the event of getting stung by jellyfish when swimming, locals will advise you to apply vinegar (a traditional remedy for such stings).  

It is extremely important to remember that Malta is a strictly Catholic country. If you have plans of visiting a church, make sure you are dressed respectfully, your knees and shoulders are covered and your sunglasses and hats have been removed. Some churches may also provide shawls or skirts for those inappropriately-attired.