El tiempo dentro de la zona arqueológica si contratas un guía te llevas como 1.20 minutos

Hola, yes we made a reservation before, because we booked a bus trip including a guide who did also the tour through the ruins.

La forma mas segura de hacer el tour y estar con la total seguridad de que el crucero te esperara en caso de que el tour se atrase es comprarlo en el Shore Excursion desk abordo. Es un poco mas costoso, pero esa es la garantia. Ahora, si el tour finaliza al medio dia, y el barco zarpa a las 3pm. Entonces ya no es responsabilidad de la empresa que dio el tour si el turista pierde el barco, pero si el barco zarpa a esa hora y el tour se atrasa y llegan al muelle a las 2:45, el barco te espera porque compraste el tour con la naviera. Hay otras empresas y taxis afuera del muelle, pueden ser menos costosas pero, el turista los toma con el riesgo de que si algo pasa, estan solos.

2 horas con los delfines, en el parque estuve como unas 5-6 horas

We did everything at port, it'll cost you $3 to take a shuttle to nearby Mahahual or simply walk out of the Costa Maya complex and you'll immediately run into a taxi depot where you can sort out the transportation you need and pricing to pretty much anywhere. My wife and I took a taxi cab (to make the most of our time, not wait for others, etc) from Mahahual to Chacchoben, then headed to Cenote Azul, stopped to get some gifts, and headed back to Costa Maya and the whole trip didn't set us back $140 total. Highly recommended.

Yes, generally the cruise-provided excursions are about 125/person for Chacchoben (at least at the time of our cruise, that was the price).

The path even though flat is uneven with tree roots growing through. There are occasional seats, if she is unsteady 2 walking sticks is advisable. Make sure you have hats, midge spray, sunscreen and plenty of water. It is a very quiet and relaxing place...lovely if she can make, next to the car park is a little market for a mini mooch round.