Chill out from the sun at the Blue Hole Mineral Spring, a 50-foot deep turquoise natural pool sitting 20 feet below a cave opening. Jump off the cliff edge like the Jamaican divers on site, if you're feeling brave. Otherwise, head down slowly on the ladder and let go from a closer distance (like I did). There's a small entrance fee to this park--located about a half-hour drive south of Negril in the town of Brighton--which includes access to an on site bar and restaurant, as well as an outdoor traditional swimming pool. But my guess is you'll be too tempted by the underground shimmering and therapeutic fresh water.