We booked for 3 day 2 nights. Definitely recommend if you are planning to go to Khao Yai as it removes the hassle of planning your way around and public transport/taxi/ride-hailing is not common in Khao Yai. TTD and the local tour operator were responsive and allowed us to customize our itinerary to the places we wanted to go. They also alerted us regarding the cash we would need to prepare for the attraction tickets beforehand. Do note that most places in Khao Yai, including restaurants and markets, prefer cash so prepare some cash before your trip. Our driver, Ms Natchaporn, was an expert navigator and friendly.