Thanks for the info--hm...$45 each way. If it costs me $5 to get into PDC from my resort, and the tour bus adds $20 each person for the round trip....that's $70 if we take the bus, or $90 if we take the taxi.
When I say "the bus", I'm thinking that if we go to the bus station in PDC, we can get on a day-tour bus (figured I'd scope it out a day or so beforehand). We arranged the round trip bus thing last year thru American Express, and it was $95 per person. We had to walk to the plaza across the street from Viva Maya to get the bus.
The collectivo won't work, as my husband has some trouble walking...more so when he's tired, but thanks for that suggestion.