La Soufrière
You are in a nature reserve where you cannot drop anchor but must moor up to an available bouy (there is a fixed cost for this and the rangers - otherwise known as boat boys - will come and help you with this manoeuvre).
La Soufrière is an essential place to visit if you are already at the colourful village of Saint Lucia: the still-active volcano can be heard bubbling away and releases impressive jets of sulphurous gases. The skyline is dominated by the Two Pitons.