You can do some window-shopping at Grand Marche during your visit to Niamey. While you're in the area, stroll along the riverfront.
You can find out about the history of Niamey when you stop by Petit Marché. While you're in the area, stroll along the riverfront.
You can spend time exploring the galleries in Boubou Hama National Museum during your travels in Niamey. While you're in the area, stroll along the riverfront.