The turquoise waters off the coast of the Cayman Islands are so clear you can see the sand on the sea bed below. But that’s not all you might see beneath you. As our boat pulled up onto a shallow sandbank, dark shapes started appearing below us in the water, gliding along the sea bed and circling around us. Our boat trip had promised we would be able to see stingrays out here and they weren’t wrong – you could see over 30 of them before we’d even stopped the boat. Swimming with stingrays is one of the biggest tourist attractions in the Cayman Islands and ‘Stingray City’ is the place to do it.