Caverne Patate, in the southwest corner of the island, is an impressive cave system with a few stalagmite and stalactite formations. There are four guided tours daily, usually at 9am, 11am, 1pm and 3pm, during which a guide points out formations with uncanny resemblances to a dodo, Buckingham Palace and even Winston Churchill! The 700m tunnel is an easy walk, but gets slippery in wet weather; wear shoes with a good grip and take a light jacket or pullover.

The track to the caves is signposted off the road from La Ferme to Petite Butte. Buses en route to La Fourche can drop you off at the turn-off.