Victoria and I used to get off the ship in Roatan every other week specifically to buy this chocolate. It's sold from a small stall right in the port area, amongst the souvenirs and coffee.
They import their cacao from Nicaragua and really only use two ingredients - cacao and cane sugar. The best part? Because there are no milk products etc it doesn't melt. We could buy it in the morning, spend a couple of hours relaxing on the beach and the bars would still be solid when we got back to our cabin.
We'd buy the assorted 4 pack and split it, 2 bars each. Unlike the Kaokao chocolate in Cozumel, these actually made it back to the ship. Some even got sent to Australia and Canada as Christmas gifts.
From memory there are only 4 different bars. 50/50 cacao, coffee and cashew nuts, cacao nibs, and dark . There maybe a 5th one, but if there is I don't remember what it is. My favourite is the cacao nibs. I think I have eaten quite a lot of Kakaw chocolate over the duration of my contract.