Good call AMEX.....if you can get a plane off in our hot high and thin air, sea level should be no problem! Go for worst case scenario, every thing else will be easier.
As for weather, believe me "sunny" Africa has what we call a wet season, some places even have two wet seasons! Cant beat a nice tropical thunderstorm!
And airspace, try FALA/JHB, can get pretty busy.
But apart from that, Canada/Africa, wouldn't know!
Cheers
KF