Yes, every situation is different and mostly I just kept walking when faced with pushy sellers. In a boat you are quite trapped. When you are traveling alone and have a temporary companion, it is smart to work together to have a great experience. 

The ridgelines are sculpted cement?
I would have to say it's probably pottery. Here's a photo of a nearby structure that seems to confirm this.. although each building here could have been constructed and/or renovated during completely different periods of time
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I find it very interesting that while architectural styles are very different, there are some similarities in construction techniques created half a world away.
https://www.oldhouseonline.com/gardens-and-exteriors/clay-tile-roofs-101
I wouldn't be surprised if these clay shingles were a renovation put in place after (or during?) the French colonial period. I'm completely guessing here, so I could be wrong