Land tour with 6 year old

Greetings all!

We will be in PV next week. We want to take a land tour on the order of the Sierra Madre Exp.( 8 yrs. min.) We have our son with us on vacation, and need to find a tour that allows children of his age.
Any recommendations out there?

Thanks!
JJ

Thanks for the reply.

I am hoping there is something better suited for us. We really want to show/teach our little guy as much as possible!

Beaner