When I think of an easy, crowd-pleasing thing to bring back from São Tomé and Príncipe, local chocolate bar from São Tomé and Príncipe is a good pick because it does not need much explanation when you hand it over. Look for a boxed version with a decent date on it, especially if you are buying it near the start of the trip rather than at the airport. I would rate it higher when it is locally made, clearly labelled and easy to use at home, and lower when it is just tourist packaging.