This was not worth our money. We had to wait way too long for a bus to come by. The buses were not very clean and the route was all one way. If you get on the stop just past where you want to go next, you have to do the entire 90-minute circuit to get there. Two-way routes would work much better.
Aubyn, our guide, was fantastic. He not only was a wealth of information but also made a concerted effort for the tour participants to get to know one another.