I was at Costa Maya November 27, 2018. If you have any problem walking. DO NOT get off the ship. They do not have the tram running that takes you from half way to end of pier.
I ended up walking over half way in when my wife got me chair for the rest of way. When I got back from excursion at Maya Chan I waited 45 minutes for wheelchair back to ship.
The local port authorities had only 4 wheelchairs to accommodate 2 ships. RCCL and a big Princess ship. I counted them as I passed each chair on pier back to ship.