Thanks for the info.  I did find the web site and some information.  My husband and I are just going to take the bus from the airport to the Cancun bus station and we figure we'll be able to get a bus.  We're landing around 1 and we'll give about an hour or so to get through customs and to the station.  I think there's a bus leaving at 4..can't wait to arrive.  We'll stop in the cafe in Progresso since we'll need to send updates to family and friends and check on how the cats are doing.  Thanks again.