There is a book of good hotels in Mexico / central america available via ADV.
With an ADV username of "Sjoerd Bakker" there is some info on his book link is here. http://www.advrider.com/forums/showp...9&postcount=93
It is also located as a sticky Hotels in Mexico and Central America under Trips Planning Americas http://www.advrider.com/forums/forumdisplay.php?f=57
It sounds like a small operation and may be a little late for you, but if you hear of anyone with it on your travels, it comes well recommended.