Taxis, tourist cabs, auto rickshaws are available in plenty. There are no standard rates except tourist cabs. Rickshaws charge a minimum of Rs 30. Town buses are also available to all important places. Conducted sight seeing tours are arranged by the private operators and the Tamilnadu Tourism Development Corporation TTDC. There are around 3-4 different day trip routes/packages available. Bus day-trip cost around Rs 125-150 and taxi day-trip cost around Rs 900-1100. Even if you arranged the taxi through the hotel even TTDC, please verify with the hotel and operator before the trip that there are no hidden costs. Because the taxi drivers demand high parking fees extra and lunch, which is already paid for. The bus/taxi drivers get commission from remote restaurants and shops and they are overpriced, try avoiding such restaurants.Both bus and taxi will take tourists to some remote high-priced restaurant for lunch, try not to eat in such places because the food is cold, overpriced and place is not clean beyond the facade, and you will end up paying for taxi driver's lunch too.
Also avoid auto drivers recommendation they will take you to the hotels for accommodation where they get 20% commission which will be already added in your room tariff without your knowledge.