It is important to make sure you have a trained guide is nearby, especially if you plan on underwater snorkelling. You may not be familiar with the tides and seasonal changes. So beginners should always, attempt with a guide nearby. When renting equipment ensure they are from licensed suppliers and check its quality before snorkelling. Ideally, it will be under the supervision of the guide. In the Maldives, of course, this will rarely be an issue, as the equipment will be thoroughly checked by the resort, but it never hurts to be too sure. When in the water, make sure to listen through to the guide's instructions, do not venture anywhere alone without telling them first! For beginners choose a location with good visibility to get used to the whole experience. Last but not least, use a good waterproof environmentally safe sunscreen, because you will burn but not be aware of it.