No tengo el dato sobre si las personas descapacitadas pagan o no. Lo lamento.

PS - Even if you don't pay for a tour, it's so easy to stand near someone giving a tour to hear in on things if you'd like. I wouldn't make it obvious unless you plan on tipping or something, but if you're just taking photos and listening in, looking around :)

Hola, selfie stick sí, pero creo que el tripie no.

Hey. First of all I also drove fromCancun to Chichen, a very easy drive so no worries, it is more dangerous to drive in the US than in Yucatán. Yes you can hire a guide, there are many at the site. However please check the prices before to ensure you get a reasonable rate. I personally did tour the site on my own, after having read a lot about the site which I found very peaceful. Last recommendation: try to get there as early as possible, it gets very crowded so best is to be there at 08.00, then you have the site for you and few others. ENJOY IT!

You could easily wonder in there on your own but there is no sign boards or anything giving you any information. If you want more information to gain knowledge on site I would say get a qualified guide which available near entrance and you will probably learn a bit from them, I heard some guides whilst there and they are quite knowledgeable.

La mejor opción es comprarlo en la entrada de la ruina, en la autopista de camino a a las ruinas y en las ruinas solo se asepta pesos mexicanos, el parque abre a las 8:00 am y cierra a las 5:00pm, sugerimos llegar temprano, esta prohibido ingresar con alimentos y la cámara filmadora al igual que la go-pro pagan derecho de uso $50mx, la entrada a la ruina extranjero vale $538 mx, mexicano paga la mitad, para moverte puedes rentar bicicletas (bike rental in chichén) tambiem hay guías que te explican en inglés y español

Day of! You can go any time during opening hours to buy entry tickets.

It is really easy, just take the 305D highway, you will find a booth where you pick up a ticket, 30 minutes later you will find another booth where you stop the toll, note they only accept pesos, there you will join the highway that runs east to west and This takes you directly to Chichen Itza, everything is signposted, on your return to Playa del Carmen is the same, have an excellent trip