A COMMUTER PLT ALTERED THE FLT PLAN IN ORDER TO ACCOMMODATE PAX; BUT FORGOT; AND LANDED AT ORIGINALLY SCHEDULED ARPT.

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IT WAS MY 4TH DAY OF FLYING; FULL DAYS EACH. I WAS ALSO RECOVERING FROM A HEAD COLD. ALTHOUGH I FELT I WAS SAFE TO PERFORM MY DUTIES AS A REQUIRED CREWMEMBER; FATIGUE WAS DEFINITELY A MAJOR FACTOR IN THIS INCIDENT. MY SCHEDULE WAS FOR 2 ROUND TRIPS: FLL-TCB-MHH-FLL; AND REPEAT. THE 1ST ROUND TRIP WENT AS SCHEDULED AND UNEVENTFUL. FOR THE 2ND OUTBOUND FLT; ONLY 4 MHH PEOPLE SHOWED UP; AND THERE WERE PICK UPS BOOKED FOR BOTH STATIONS. AS THE FOLKS WERE ALL GOING TO MHH; I TOLD THEM THAT WE'D GO THERE FIRST; INSTEAD OF TCB. I PICKED UP MY PRE-STORED CLRNC; WHICH IS FILED TO TCB. I FLEW ON THE IFR FLT PLAN; RECEIVING A ROUTING FROM CTR DIRECT TO TCB. I FLEW THIS RTE AS USUAL; LANDED IN TCB. AS I WAS SHUTTING DOWN I LOOKED AT THE 'WELCOME TO TREASURE CAY' SIGN AND REALIZED MY MISTAKE. MORTIFIED; I LOOKED BACK AT THE PAX. THEY WERE ALL LOOKING AT ME; A BIT SURPRISED AND CONFUSED. I RECOGNIZED THEM ALL AS LCL; REGULAR PAX. I SAID 'OH NO; YOU'RE ALL GOING TO MHH; AREN'T YOU?' LUCKILY; THEY ALL LAUGHED. I ASKED WHY SOMEONE DIDN'T SAY SOMETHING TO ME? THEY ANSWERED THAT THEY WERE SLEEPING; READING; OR JUST NOT PAYING ATTN UNTIL IT WAS TOO LATE. AS I STILL HAD TO PICK UP THE TCB PAX; IT WAS NOT A PROB; JUST AN UNEXPECTED INCONVENIENCE TO THE MHH FOLKS. THEY WERE ALL VERY UNDERSTANDING AND NICE ABOUT THE WHOLE AFFAIR.