Visit the Sulfur Springs.
You'll know when you're in St. Lucia once you touch down and get a strong whiff of sulfur. The distinct scent is that of the island's most historic attraction, the Sulfur Springs. The landmark is the Caribbean’s only drive-in volcano and is the most active mass area in the Caribbean.
At Sulfur Springs Park, you will find a variety of bubbling hot Spring water pits, steaming vents, and mud pools. Sulfur and other natural minerals flow organically through these waters, and have great healing benefits to the skin, so you’ll definitely want to stay for a while and take a splash.