I think that the poster is looking for a water taxi from the south side of Caye Caulker to the north side of Caye Caulker. If that is indeed the case, then there isn't one that I know of.
Chime in OP. Is that what you were asking?
...and no need to be snarky, San Pedro Breeze. The vast majority of people on ACMB are just trying to be helpful.