By public transport
You can usually count on taxis fares in Saint-Louis to be a solid fixed rate of 500 F CFA. From the garage gare routiere to downtown or at night expect to pay 600 F CFA. There is a fairly decent "car rapide" public transport system that shouldn't cost more than 100 F CFA for your average stretch. On the Island of Ndar, there are calesh rides designed for site-seeing tourists. However, most of the historic city is easily accessible by foot.
Bike And Scooter Rental
To see more of Saint-Louis, why not rent a scooter or a bicycle, this is a great way to cover more ground and to explore some places that you might not be able to reach on foot. Located on the corner of Rue Blanchot and Quai Roume on the Island. Scooters are available for 10000CFA/Day and bikes for 5000CFA/Day.