Curieuse is a good half-day trip excursion, usually combined with great snorkeling around the islet of St. Pierre, only 15 minutes away from Praslin (from the beach Cote d'Or) with a small motor boat.
Usually the boats arrive at the bay where most tortoises are as well as the ranger base and some baby tortoises. From there, there are two routes: most people follow (or have to follow in order to meet their group for the barbecue) an 1-hour walk towards the house of the lepers' doctor.
I found this walk very scenic. It could take less time if you walk fast but if you take it easy, you will start noticing many kinds of different crabs, sea shells and tropical vegetation. There are some informative signs along the path which are a bit difficult to read as they have faded out by the sunlight, but it's better than nothing. This path is well maintained and very easy to cross. At the end you reach the beach (St. Jose is the name, if I remember well) where the house of the lepers' doctor is located. The house is also worth visiting as there is an exhibition with information about leprosy. As for the beach in this bay, it is sandy but nothing great for snorkeling. For the latter, though, St. Pierre is exceptional...
We didn't try the second path at the other side of the island as it is not very well preserved and seemed difficult to cross.
Whether you decide to take a taxi-boat or a combo-trip to Curieuse and St. Pierre, do some research as you will see that there is a lot of variation in the prices!
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