What are the best hikes, treks and climbs on the continent?
Best in what sense?
Hardest, easiest, glaciers, rock or wildlife?
The Ahaggar may have the most difficult peaks (all rock).
Mount Kenya is a spectacular peak.
Rwenzoris have the biggest glaciers and lots of wildlife.
Mount Elgon is easy, has hot springs in the crater and lots of wildlife.
Of course Africa is the 2nd biggest continent and a big place. Other than Kilimanjaro, Kenya and South Africa it doesn't seem that there are that many people on SP that know Africa well enough as a whole to answer the question fully.