Me and my wife booked a tour on Viator to visit Chichen Itza for a day trip including free all you can eat buffet and a Cenote (like a underground small lake) visit. The price of the tour was very affordable that we paid in advance online. They pick up us on time early in the morning and transfer us to a big bus, once on route Mr. Rodrigo (travel guide) keep us informed all the time and Mr. Antonio (bus driver) was very professional. At the buffet you need to buy your drinks because they are no included. Drinks are no too expensive but be adware if you pay with credit or debit card (the Chilam Balam restaurant overcharged us for a frozen margarita and a regular soda over US$25.00) (we only saw this after we get back home in NY). We like to thanks Amigo Tours, Mr. Antonio and Mr. Rodrigo.