"La Brioche" (Avenue Kabila) is a nice French style cafe also serving light meals.
"Petit Bruxelles" is a garden resto at Kabanga no.624 (north of centre).
"La Kalebasse" in Ave. Likasi (beside Hotel Kaby) is a local bar in a backyard (with DJ music in the evening).
Several drinking terraces at Ave. Adoua, southbound from Ave. Kabila.
The safest way to leave by using the direct rail link to kinshasa and leave at Njili airport which might cost a lot of dollars so it's best you leave the way you came.
There is no "direct rail link to Kinshasa", the railway only goes as far as Ilebo (very rare, from where you have to find a boat via Badundu to Kinshasa or get a shared taxi to Kikwit and then Kinshasa), and about every 15 to 30 days trains to Kananga, Kindu and Kalemie.