SMA MAKES APCH AND LNDG AT WRONG ARPT. NOT IN CONTACT WITH TWR.

Narrative

I WAS FLYING ON THE 130 DEG RADIAL TO THE OCEANSIDE VOR ENRTE TO OCEANSIDE ARPT. AFTER XING THE VOR; I SET A COURSE FOR 92 DEG FROM TO TAKE ME TO OCEANSIDE. I HAVE NEVER LANDED AT OCEANSIDE; BUT HAVE FLOWN OVER IT SEVERAL TIMES. SEVERAL MINS AFTER XING THE VOR; I COULDN'T FIND THE ARPT. AFTER SEVERAL MORE MINS I LOCATED WHAT I THOUGHT WAS OCEANSIDE ARPT. I XMITTED ON 123.0 (PUBLISHED FREQ) BUT GOT NO RESPONSE. I DIDN'T THINK ANYTHING OF IT AS A LOT OF TIMES YOU DO NOT GET A RESPONSE AT UNCTLED ARPTS. AFTER SPOTTING THE ARPT AND IDENTING THAT THE RWY WAS 6 AND 24; I SET UP FOR A R TFC PATTERN AS SPECIFIED FOR RWY 24 FOR NOISE ABATEMENT. I ANNOUNCED MY INTENTIONS ON 123.0 ON DOWNWIND; BASE AND FINAL. I LANDED AND ROLLED CLR OF THE ACTIVE. AT THAT POINT; I NOTICED A SIGN THAT STATED TO CONTACT GND ON 121.8. I REALIZED AT THIS POINT THAT I HAD LANDED AT AN ARPT OTHER THAN OCEANSIDE. IT TURNED OUT TO BE PALOMAR. AFTER THINKING ABOUT THIS; I BELIEVE MY PROBLEM AROSE BECAUSE I HAD NOT RESET MY HDG INDICATOR SINCE THE TIME BEFORE I TOOK OFF. THIS RESULTED IN AN ERRONEOUS HDG INDICATION OTHER THAN 92 DEG. IN ADDITION; I HAD NOT FLOWN IN THIS AREA FOR SEVERAL MONTHS AND WAS NOT TOTALLY FAMILIAR WITH THE TERRAIN. THE ARPT THAT I LANDED; PALOMAR; ALSO HAS A SINGLE RWY; 6 AND 24. ONCE I SAW THE RWY NUMBERS; I THOUGHT THAT I HAD FOUND OCEANSIDE AND BEGAN CONCENTRATING ON MY PRELNDG CHKLIST AND DUTIES. I DID NOT NOTICE THAT THERE WAS A CTL TWR ON THE FIELD UNTIL I LANDED AND SAW THE SIGN INDICATING THAT GND WAS 121.8. THE FACT THAT IT WAS NEAR DARK MADE THE ARPT AND SURROUNDING AREAS DIFFICULT TO LOCATE. I SHOULD HAVE REALIZED THAT I HAD PASSED THE ARPT AFTER 5-6 MINS AFTER PASSING THE VOR AS THE ARPT IS ONLY 23 NM E OF THE OCEANSIDE VOR. I SHOULD HAVE HEADED BACK TOWARDS THE VOR AND REFLOWN THE 92 DEG FROM RADIAL WING THE VOR INSTEAD OF HDG INDICATOR HDG ONLY.