PILOT REPORTS LANDING AT PWA WHILE ATTEMPTING TO LAND AT HSD VISUALLY.

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PROB AROSE: I WAS INBOUND TO HSD ON AN IFR FLT PLAN. UPON DSNDING I WAS ADVISED BY ATC THAT THE ARPT WAS AT 12 O'CLOCK POS AND SOME NUMBER OF MI AWAY. I PROCEEDED TO WHAT I THOUGHT WAS THE HSD ARPT. IN FACT; I WAS PROCEEDING TO PWA LOCATED ABOUT 5 NM TO THE SE OF HSD. I INDICATED TO ATC THAT I HAD THE FIELD IN SIGHT AND WOULD CANCEL MY IFR FLT PLAN. ATC OBLIGED THE CHANGE AND I BEGAN POS RPTS ON HSD CTAF AND LANDED. AFTER TAXIING FROM THE ACTIVE RWY TO THE RAMP; I STOPPED IN FRONT OF ONE OF THE FBO'S. PROB DISCOVERED: I WAS CONTACTED ON THE HSD FREQ BY THE TWR AT PWA. I BECAME AWARE AT THAT TIME I HAD LANDED AT PWA INSTEAD OF HSD. CONTRIBUTING FACTORS: I WAS UNFAMILIAR WITH THE OKLAHOMA CITY AREA. THE HSD AND PWA ARPTS HAVE IDENTICAL RWY ORIENTATIONS. WHEN ADVISED BY ATC THAT THE RWY WAS AT 12 O'CLOCK POS; THE PWA RWY WAS CORRECTLY ORIENTED AND ALIGNED WITH THE NOSE OF THE ACFT. CORRECTIVE ACTIONS: NONE TAKEN AS INCIDENT WAS CONCLUDED. HUMAN PERFORMANCE CONSIDERATIONS. PERCEPTIONS; JUDGMENTS; DECISIONS: DUE TO THE CORRECT ORIENTATION OF THE FIELD AND ITS POS DESCRIBED TO ME BY ATC; I BELIEVED I WAS PROCEEDING TO THE CORRECT AIRFIELD. ACTIONS OR INACTIONS: I BELIEVE THAT THE ADVISORY BY ATC; OF THE POS OF THE AIRFIELD COULD BE MADE MORE CLR. UNDER THESE CIRCUMSTANCES OF AN AIRFIELD OF IDENTICAL ORIENTATION LOCATED APPROX 5 MI AWAY; A BETTER COURSE OF ACTION MAY BE TO ADVISE PLTS ANOTHER SUCH FIELD IS IN THE VICINITY. PREVIOUSLY; I HAVE FLOWN TO RAP AND THE CTLRS ADVISED OF THE AIRFORCE BASE LOCATED DIRECTLY TO THE N OF RAP. FURTHER; BECAUSE OF THE DANGER OF SO MANY PLANES TRANSITIONING IN THE VICINITY OF HSD AND PWA; SOME TYPE OF COORD FOR LNDG BY ONE CTL TWR MAY BE ADVISABLE. NEXT; AS A PLT; I SHOULD NOT HAVE ASSUMED; BECAUSE ATC CALLED THE ARPT'S POS FOR ME AND THAT I IDENTED AN ARPT AT THAT POS; THAT I WAS PROCEEDING TO THE CORRECT ARPT. FURTHER; I SHOULD HAVE STUDIED THE ARPT DIAGRAMS FOR AN ARPT THAT IS SITUATED SO CLOSE TO THE DEST ARPT TO AVOID THIS EXACT CONFUSION. HOWEVER; EVEN IF I HAD AVOIDED LNDG AT PWA; I WOULD HAVE ALREADY VIOLATED PWA'S CLASS D AIRSPACE. FINALLY; I WAS ATTEMPTING TO LESSEN THE CTLR'S LOAD BY CANCELING THE IFR FLT PLAN SINCE THE WX WAS CLR. A BETTER COURSE OF ACTION WOULD HAVE BEEN TO REMAIN UNDER ATC CTL UNTIL THE TERMINATION OF THE FLT. HERE; ATC MAY WISH TO ADVISE TFC THAT SUCH COURSE MAY BE PREFERABLE BECAUSE OF THE PROX OF THE OTHER AIRFIELD. THIS MAY FURTHER ENHANCE CTL AND REDUCE SUCH MISHAPS.