The most rewarding way to understand Saint-Pierre is on foot, following the seafront road through the town. The route takes you past the working waterfront — fishing boats, a small market, the dive centre jetty — and continuously beside and between ruins that are woven into the fabric of the modern town. Old stone foundations support new buildings. Ruined walls serve as garden borders. The palm-lined promenade runs through what was once the main commercial boulevard of the colonial city.
The walk from the southern end of town to the Musée Vulcanologique and back covers most of the key sites in under two hours. What makes it unusually interesting is the layering: you are not walking through a preserved ruin site but through an inhabited town where people live among the ruins. Houses are built on the footprints of destroyed houses, and the collapsed walls of 1902 sit next to parked cars and schoolchildren. This is not Pompeii behind a fence — it is a living place that has never fully escaped its history.