One of the easiest and the most convenient way of reaching the trail's starting point is by renting a scooty or a car. You will easily get a scooty for 10 USD or less per day here.
So, you can simply take your scooty and park it just opposite the trail and go on the hike. This way, you save a lot of money and you have time flexibility as well.
There aren't any direct buses coming to this stop so you would be hard-pressed to reach here. One option is to take the Chamarel bus and then walk for 6.5 km to reach here but it would be very tiring.
Finally, you can hire a taxi to drop you off and pick you up at the road here. It will be costly but if you don't want to walk and don't have a license for renting a scooter or a car, then this is your only option to reach.
Piton De La Petite Riviere Noire Mountain Hiking Route Details
As I said above, the trail for the Black River Peak is around 300 m from the Gorges Viewpoint. And you would see a board and a trail sign on the rock as depicted in the above picture to mark the trail start.