I always thought that driving a car in Thailand would have not been a great idea. In our last visit we decided to give it a go. I lived in Rome for 4 years, that was a good training I thought. Maybe I should re-think that LOL.
The very positive side is that you stop wherever and whenever you want experiencing the life as a local. Any visit to any temple was an trip by itself, with many stops to small sanctuaries, like the one in the photo, local market, festivals and small shops. This is something you would never do in a tour trip, from here to there and back. Lots of freedom
The negative side is that it is more expensive and you need to have 4 eyes wherever you go, paying attention to any move around you, assuming that other drivers may not follow the sign or the traffic like. We usually never do the car insurance, however in Thailand we did it, even if at the end it all went without any problem.