This is a small sand island that is a little more than an hour west of Rodrigues.  Ile Cocos is a nature reserve so there is no overnight camping and you need to have a permit to visit.  I really enjoyed walking around the island along it's paths.  For some reason it seemed to me that colours were just a bit more intense here.  If you do go to Rodrigues island, Ile Cocos is a great little day trip.