There is nothing more unpleasant than a mask full of half saltwater, so be sure to cinch the strap on your mask tightly so that no water is printed. This can be done simply by placing the mask on your head first, loose, then pulling the tight straps on either side of the head.

It may sound rough, but the easiest way to keep your mask from getting blurred is to spit it into the lens and rub saliva around, then dip it in water to rinse.

Remember to attach the snorkel to the mask strap to keep it upright while you are swimming and to prevent water from entering the tube.

If water enters your breathing tube, do not panic. Just stop, lift your head above the surface of the water, and remove the mouthpiece and flush or blow it out to get water out.

Don’t be afraid to swim: Yes, they look dorky, and they can hardly walk around while you’re still on the boat. But they will make a different world when you are in the water, especially if you are not a strong swimmer. Try to wait until the last minute before placing your fin – on or near the boat ladder; Doing it in water can be complicated.

Yes, you can dive with the snorkel mask! I love snorkeling around the baths on Virgin Gorda in the British Virgin Islands, but you need to dive to appreciate the rock formations here. Just remember to take a deep breath and don’t try to breathe through your breathing tube!

Sea Trek gives you the experience of visiting the ocean floor without having to learn to dive. However, it is more like wearing an old fashioned diving suit, so your movements are quite limited. I would recommend Sea Trek as a one-off novelty – something to do if you never plan to get scuba diving certification. But your experience can vary greatly from location to location, so be sure to get some details about your tour before you go.