KING AIR PLT ON APCH TO RWY 26 AT DEN IN VMC IS INSTRUCTED TO CIRCLE TO RWY 17L. RWY 16L IS SIGHTED INITIALLY CAUSING A CIRCUITOUS ROUTE TO LAND 17L.

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I WAS A LITTLE SHAKY AFTER BEING VECTORED AROUND SOME THUNDERSTORMS THAT INCLUDED MODERATE TO SEVERE TURBULENCE AND MODERATE ICING. I WAS GIVEN A VECTOR TO INTERCEPT ILS RWY 26 AT DEN. SHORTLY AFTER THE LOC INTERCEPT I WAS IN VMC WITH 6000 FT VISIBILITY AND THE ARPT IN SIGHT; BUT WINDSHEAR WAS CONTINUOUS. I CALLED THE FIELD IN SIGHT AND WAS TOLD TO CONTINUE. SOMEWHERE INSIDE THE MARKER I WAS GIVEN A CIRCLE TO LAND TO RWY 17L. I CALLED RWY IN SIGHT AND WAS TOLD IT WAS OKAY TO WIDEN TO THE N; BUT I GUESS I SAW RWY 16; NOT RWY 17. AFTER NOTICING MY MISTAKE I ASKED FOR A VECTOR; BUT DIDN'T HEAR ANYTHING. I ASKED AGAIN AND WAS TOLD TO TURN E. AT THAT TIME I SAW RWY 17L AND WAS CLEARED TO LAND. NO MENTION WAS MADE OF ANYTHING; BUT I FEEL I SHOULD WRITE THIS BECAUSE THE TWR GAVE ME A CIRCLING INSTRUCTION AT THE LAST MINUTE AND I DIDN'T REALLY HAVE TIME TO GET ORGANIZED. I SAW A S RWY; BUT IT WAS THE WRONG RWY. I SAW RWY 16; NOT RWY 17. AFTER THE PREVIOUS THUNDERSTORMS AND TURBULENCE; AS WELL AS A LONG DAY; AND THE FACT THAT I WAS SINGLE PLT; I'M GLAD I'M STILL HERE; AND I'M GLAD IT WASN'T NIGHT AND IMC. IN THE FUTURE I'LL CONCENTRATE MORE ON THE ARPT DIAGRAM; AS WELL AS A BETTER PREFLT BRIEFING. THE BUSIER ARPTS ARE CHALLENGING SINGLE PLT.