Cousin Island is a nature reserve quite close to Praslin.
We got on a boat on Praslin and it took about 30 minutes to get there. We then got on a speed boat to take us onto the Island.
It has a variety of birds, geckos and tortoises.
The tour lasts about an hour.
A word of advice though. Wear a long sleeved shirt or top, and long trousers. Also wear light colours. There are lots and lots of mosquitos. Take plenty of mosquito spray and cover yourself before going in. I didn't put enough on. I had shorts and a short sleeved shirt and got bitten about 30 times on each elbow and arms, 10 or more on my face and head, and on my legs.