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Most of the walk is easy, following a path through the forest and then along several craters without any difficulty or vertigo, before reaching Martin’s Crater Only the final ascent gets steeper and steeper – very, very steep towards the end – on volcanic gravel, but you can avoid it by taking the path on the left both on the way there and back.

This tour of the lagoon (Blue Lagoon) involves walking in the water for 500 metres (ankles or knees deep, depending on the tide). There’s also a 15-metre stretch to swim. The depth is 7 metres at the marked point, but there’s no current. The route starts from Club Med Djerba or the El Mouradi Hotel. On the left-hand side of the lagoon, there’s a dirt track lined with stalls selling local specialities: trainers are recommended.