Here's the info I gathered from 2010. We ended up with 12 people from various DIS families. Like I said earlier, it was a decent introduction to the city. :
This sounds awesome, and affordable. Looks to be just about double the HoHo bus, and private for just us. I sent an inquiry and will see my sister and niece this weekend to show them the info. Niece speaks pretty good Spanish as well, so she can call and get more info if need be.
Thanks so much for the link!
If anyone else is interested in joining in on a Thursday tour, let me know. We will be 5 adults and a 6yo (who will likely be playing games on his tablet the entire time!)