I specifically booked a catamaran because my girlfriend suffers from seasickness and needs the stability that a larger vessel provides. Upon arrival, we were told the catamaran was broken, and they gave us a very small boat instead.
This was not a suitable replacement. A small boat is much more unstable, which is exactly what we tried to avoid. There was no prior notification about the technical issue and no offer of a partial refund for the downgrade. Very poor communication and a disappointing experience.