PVT PLT OF SMA SINGLE ENG LAND ACFT INADVERTENTLY MADE A DSCNT TO THE WRONG ARPT WHILE TALKING TO THE INTENDED DEST ARPT APPROX 12 MI FURTHER.

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ON MAY/MON/93 I WAS DOING A FAVOR FOR A FRIEND WHO NEEDED TO LEAVE HIS PLANE AT OQU. HE FLEW AHEAD IN AN SMA. I WAS TO PICK HIM UP IN OQU AND FLY HIM BACK TO PMX. ANOTHER FRIEND WHO IS A PLT CAME ALONG FOR THE RIDE AND TO NAV FOR ME. AS WE APCHED THE ARSA AT PROVIDENCE; I ATTEMPTED TO CONTACT OCEAN APCH SEVERAL TIMES; BUT EACH TIME I ATTEMPTED TO DO SO; OCEAN APCH RESPONDED THAT THEY WERE UNABLE TO HEAR ME OVER A LOUD BUZZ ON MY RADIO. I CHANGED FREQS TO OQU WHO WAS ABLE TO HEAR ME WITHOUT PROB. I DECIDED TO FLY UNDER THE ARSA AND PROCEED DIRECTLY TO OQU. PAX POINTED OUT GREEN STATE TO ME INSTEAD OF OQU AND I PROCEEDED TO THE WRONG ARPT. WE DIDN'T REALIZE WE WERE AT THE WRONG ARPT BECAUSE THE RWY NUMBERS AT GREEN STATE ARR 16-34 AND 23-5; JUST AS THEY ARE AT OQU. OQU INFORMED ME I WAS CLR TO LAND AND I TURNED BASE FOR A LNDG AT GREEN STATE. I REALIZED I WAS AT THE WRONG ARPT WHEN I SAW THE VORTAC ON THE FIELD AND OQU TWR TOLD ME THEY DIDN'T HAVE ME IN SIGHT; AND ASKED ME IF I SAW PARALLEL RWYS. OQU TWR TOLD ME TO ATTEMPT TO CONTACT OCEAN APCH AGAIN. THIS TIME; OCEAN APCH; HAVING BEEN INFORMED OF MY PRESENCE BY OQU AND THAT I WAS HAVING TROUBLE XMITTING BUT COULD RECEIVE THEIR FREQ; INSTRUCTED ME WITH A SQUAWK CODE AND VECTORED ME TO OQU AND TOLD ME TO CHANGE FREQ TO OQU TWR. A JET PASSED ABOUT 1/2 MI FROM US AS WE LEFT GREEN STATE; EVASIVE ACTION WAS NOT REQUIRED.