Don't forget to bring your camera to capture the stunning cascades of Bassins Bleu. If it's raging, you may be able to feel the mist on your skin.
You're spoiled for sightseeing choice when staying in Jacmel. Bassins Bleu is a great place to kick off here, but there are lots of other worthwhile places to discover. Cathedral of Saint Philippe and Saint Jacques, Iron Market, and Maison Cadet are near the cascade of water and will round out your day nicely.