The private longtail tour in Ayutthaya is maximum 4 hours, if you perhaps finish the temple visits quicker than usual, the tour might end a bit earlier. There is no tour guide on this tour, as the taxi driver will just take you to the spots of the tour. The local Thai captain of the boat and the car driver speak very basic English, just enough to communicate about the tour. The distance from Pattaya to Ayutthaya is far, this day tour involves a lot of travel time by car. If donations are asked during the temple visits, this is not mandatory but of course allowed if you want. Entrance fees on the other hand are mandatory Rain in Thailand is unpredictable and can happen anytime. The tour will continue in the rain if conditions are safe, and no refund will be granted. If conditions are determined to be unsafe, the tour will be canceled and you can reschedule or get a full refund.