Keep an eye out at Grand Marché — you're likely to come across some unique curio among the stalls here. After you've had a good look at the wares, try some fare from one of the nearby food vendors.
If you've got time to stop for a while in Bobo Dioulasso, Grand Marché is a good place to kick off your exploring. This community marketplace is one of numerous attractions worth seeing here. Bobo Dioulasso Cathedral, Dioulassoba Mosque, and Forêt de Kou are also ready to be explored close by.