Ana - will they/would they collect? I often see people on a Mexican trikes with bages of plastic bottles, perhaps it's them, perhaps it could be them! I would happily put seperate bins in our Vacation Rental for plastics - as would many other hotels etc.
We were at the bottling warehouse yesterday and clarified with them that they take back only the 5-gallon water jugs, but no other size water bottles. They did take back our small Coke Lite bottles, too.