These twin mountains are truly beautiful, so beautiful I made an oil painting of them that is the only piece I have created that is actually any good. If you like to hike, pack your hiking boots and explore the Pitons and surrounding area.
I have been to St Lucia twice, and I always find this as the most memorable experience. If you have never taken a dip in a volcanic spring before, you must do this here. Just be prepared for the stinky sulfur smell (it did clear my sinuses though!)