Trace Adkins fans are not happy ...they are complaining that Trace ruined their country cruise by jumping ship in Jamaica after getting into a heated argument with an impersonator... and all they got in return were concert tix. The Cruise officials lied to them and said Trace left for a family emergency -- and tried to distract fans with an hour-long open bar. Trace's camp is now trying to make good by offering passengers free tickets and a meet-and-greet at a future concert. For some fans, it's awesome. But others -- who paid thousands to go on the cruise -- say they can't collect ... because they came from faraway places -- even foreign countries.