ferry from cancun to miami??????
 

does anyone have some info about a ferry from cancun or belize to miami or another port in the usa?

and rates for one bike, two persons?

Nobody will have such info because such a ferry connection does not exist. Do a search of the HUBB.
There have been attempts to start up a ferry service but they were poorly planned , underfinanced and greatly over estimated the demand for the service. One actually made trip or two and was cancelled years ago .
Your only option is to book your vehicle in with one of the cargo shipping lines from Tampa Bay area to Progreso, the port of Merida, but you personally will have to fly .