Must have been an awesome trip
Want to do this myself. Keen to hear about your experience.
Did a great trip from FALA to Zambia (FALA->Francistown->Chobe->Livingstong->~300 miles up the Zambezi from Livingston) in a B407 low level.
Kept adding animal sightings in my position reports, much to the chagrin of jets at >30kft, although they kept asking for updates.
Hovering around a good sighting was done on more than one occasion ;-)
Did another trip FACT to FAPE low level along the coast... another awesome trip.
IMNSHO this is what flying is about. Take your time and enjoy the experience (if possible).
DISCLAIMER: Expensive as f*** in a turbine helicopter, but soooo much fun.