Just some related observations from our trip last month...
I really found it somewhat disconcerting how fast some cars zipped (eg. some over >50km/hr?) through narrow-ish corridors (without sidewalks) that were shared with pedestrians.

Felt the reflex to tip numerous times because the service was so great nearly everywhere we went. The gifts we presented the odd times seemed to be quite well received (though we tried to limit ourselves to budget establishments).