Canadian,
I was supposed to do the same trip on the next contract in Maturin, but we only got as far as Hammond, Louisiana. Lovely trip it was, water like glass most of the way.
Personally, I have done Cape Town-Abidjan and back, CPT-Malabo, CPT-LAD-CPT, CPT-Maputo-CPT mostly in the 61 but some 76 too. It gets a bit long when you are sat in the back, though. I have respect for the pilots who do it for a living.