AN SMA PLT RAN OFF OF THE END OF THE RWY IN A RAINSTORM. THE PLT WAS MAKING A STOP FOR US CUSTOMS.

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APCH TO FPR. ATIS RPTED 900 OVCST; 4 MI VISIBILITY. WE WERE VECTORED TO ADF RWY 9 APCH. UPON REACHING MINIMUM DECISION ALT; DID NOT SEE ARPT UNTIL OVER RWY TOO LATE TO LAND. REQUESTED VOR RWY 14 APCH; AGAIN REACHED MINIMUM DECISION ALT; DID NOT SEE RWY UNTIL TOO LATE. AT THIS POINT; HAD 1 HR FUEL; ELECTED TO TRY APCH AGAIN. PASSING VRB ARPT IT WAS IN THE CLR; BUT RAINSHOWER STILL OVER FPR. COMPLETED APCH; SIGHTED RWY AT MINS. CLOSER IN DISCOVERED WE WERE LINED UP WITH RWY 18 WHICH WAS CLOSED. SPOTTED RWY 14. TURNED TOWARD IT AND LANDED 1/2 WAY DOWN. ACFT APPARENTLY HYDROPLANED AND RAN OFF END OF RWY. KEPT MOVING AND RETURNED TO RWY NO DAMAGE TO ACFT OR RWY LIGHTS OR EXIT LIGHTS. PROB: WHEN RETURNING FROM FOREIGN COUNTRY; UNITED STATES CUSTOMS REQUIRES LNDG AT FIRST AVAILABLE ARPT OF ENTRY WHICH WAS FPR. FORECAST AND ATIS APPEARED REASONABLE. WITH RPTS OF STRICT INFLEXIBLE RULES OF CUSTOMS; I WAS REDUCED TO NO OTHER OPTION THAN LNDG AT FPR. UNDER ANY OTHER CIRCUMSTANCE; I WOULD HAVE DIVERTED TO MY ALTERNATE; OR MORE LIKELY; LAND AT VRB WHICH WAS GOOD VFR; LESS THAN 10 MI FROM FPR. IN FACT; I TOLD ZMA CTLR IF I DID NOT SUCCEED IN THIS; MY THIRD APCH; I WOULD LAND AT VRB AND FACE WHATEVER CONSEQUENCES I HAD TO FOR NOT LNDG AT FPR WHICH I DEEMED TO BE LESS THAN IDEAL SAFE CONDITIONS.