The town of Bamako combines traditional architecture, colonial and modern architecture. Apart from the modern roundabouts, which I've described in another journal page, there's lots to do and see in Bamako.
The town is surrounded by high hills. Out towards Kati (another town) there are two 'tourist roads' (la piste touristique de Koulouba). These not only take you up to the old caves but give you a chance to view the city from a high vantage point. It's also considerably cooler there and there are several very nice picnic spots.
Below the Koulouba tourist road is the Parc Zoologique.
Other sites you may like to visit in that area are:
The Botanical Garden, and the National Museum
Over the other side of the River Niger (take the old bridge as its quicker) si the National Institute of Arts. Here you will find local dancing displays, Music concerts with well-known Malian players and other public events.
One natural feature not to miss is the 'submersible bridge' (la Chaussée submergée) a natural feature with a road of sorts built on it ... only accessible during dry season. It's quite stupendous. It’s marked off the Koulikoro road out of town.
The valley of Oyanko 15 kilometres out of Bamako is very pretty and worth a visit.