BE36 PLT LANDS WRONG RWY ON VISUAL APCH IN HAZY CONDITIONS. LAND WRONG RWY. REDUCED VISIBILITY.

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I WAS ON AN IFR FLT; IN VMC; FROM SAN TO MY HOME FIELD SJC AT 10000 FT. IT WAS AN UNEVENTFUL FLT. AT 75 MI FROM SJC; BAY APCH INSTRUCTED ME TO FLY 300 DEGS TO INTERCEPT AND TRACK THE LOC FOR RWY 30L. ABOUT 50 MI OUT; ATC ASKED WHICH RWY I WANTED; AND I REQUESTED RWY 29 AS USUAL; SINCE IT IS CLOSEST TO MY PARKING. ATC ACKNOWLEDGED; AND TOLD ME TO CONTINUE TRACKING THE RWY 30L LOC. THERE WAS A FAIRLY BUSY STREAM OF IFR ARRS FROM THE S; AND ALL WERE BEING GIVEN THE SAME INSTRUCTIONS: INTERCEPT AND TRACK THE RWY 30L LOC. ATC ASKED ME TO MAINTAIN MAX FORWARD SPD AS LONG AS POSSIBLE; TO FIT IN WITH OTHER ARRIVING TFC. ABOUT 20 MI OUT; ATC ASKED ME TO RPT THE FIELD IN SIGHT. WHILE THE WX WAS CLR; THERE WAS THICK HAZE THAT MADE VISIBILITY OF THE SURFACE POOR. I DID NOT HAVE THE FIELD IN SIGHT 20 MI OUT. ABOUT 15 MI OUT; I WAS STILL HIGH AND FAST WHEN ATC VECTORED ME TO TURN L TO 270 DEGS FOR OVERTAKING TFC. AFTER THE B767 HAD PASSED; I WAS AGAIN ASKED TO RPT THE FIELD IN SIGHT. ALTHOUGH VISIBILITY WAS STILL POOR; I WAS ABLE TO MAKE OUT THE FIELD THROUGH THE HAZE; ALTHOUGH I COULD NOT MAKE OUT THE INDIVIDUAL RWYS. I RPTED THE FIELD IN SIGHT. ATC THEN CLRED ME FOR A VISUAL APCH TO RWY 29. I TURNED BACK TO THE FIELD ON A 45 DEG INTERCEPT TO THE FINAL APCH COURSE AND STARTED DOWN FAST. I CAPTURED AND BEGAN TO TRACK THE GS FOR RWY 30L; WHICH PROVIDES GOOD DSCNT GUIDANCE TO THE NUMBERS ON RWY 29. I WAS NO LONGER TRACKING THE RWY 30L LOC (AT LEAST I DIDN'T INTEND TO); BUT WAS USING THE GS ON THE HSI AS I FREQUENTLY DO ON A LONG; STRAIGHT-IN APCH WHEN VISIBILITY IS POOR. ABOUT 3-5 MI OUT; I SPOTTED THE PAPI FOR WHAT I THOUGHT WAS RWY 29; AND USED THAT AS MY VISUAL REF FOR LINING UP ON THE RWY (IT LATER TURNED OUT TO BE THE PAPI FOR RWY 30L). I CONTINUED MY DSCNT USING THE GS AND THE PAPI. AS I GOT CLOSER; I KNEW THAT SOMETHING DIDN'T LOOK RIGHT; BUT COULDN'T IDENT THE PROB; SO I CONTINUED INBOUND. FINALLY; I REALIZED WHAT WAS WRONG WHEN I FOUND MYSELF AT 200 FT AGL COMING OVER THEDISPLACED THRESHOLD FOR RWY 30L (RWY 29 DOES NOT HAVE A DISPLACED THRESHOLD). ON SEEING THIS; I DECIDED THAT IT WOULD BE UNSAFE AT THAT POINT TO SIDESTEP TO RWY 29. I KNEW FROM MONITORING THE RADIOS THAT THERE WAS NO TFC ON SHORT FINAL TO RWY 30L; AND SO PROCEEDED TO LAND ON RWY 30L AND TO GET OFF THE RWY AS QUICKLY AS POSSIBLE. ALL WORKED OUT OK; TWR DIDN'T HAVE TO WAVE ANYONE OFF; AND I WAS CLR OF THE RWY WELL BEFORE THE NEXT PLANE CAME IN. IN 20/20 HINDSIGHT; I SHOULD HAVE GONE AROUND INSTEAD OF LNDG; AND SHOULD HAVE TOLD TWR THAT I WAS LNDG ON RWY 30L BEFORE DOING SO. BUT IN THE HEAT OF THINGS I WAS SO INTENT ON COMPLETING A SAFE LNDG THAT I JUST KEPT FLYING THE PLANE AND DIDN'T COMMUNICATE UNTIL I WAS SAFELY OFF THE RWY. THERE WAS NO CONTACT FROM THE TWR AFTER CLRING ME TO TURN BACK FROM THE 270 DEG VECTOR AND CLRING ME TO LAND RWY 29; UNITL I WAS OFF THE RWY. TWR THEN ASKED IF I WAS FAMILIAR WITH THE SJC RWY LAYOUT. I REPLIED THAT; YES; I WAS FAMILIAR; BUT THAT I MISTAKENLY LINED UP AND LANDED ON THE WRONG RWY. TWR REPLIED THAT THEY JUST WANTED TO MAKE SURE THAT I WAS AWARE OF WHAT I'D DONE; AND THEN HAD ME CONTACT GND FOR TAXI TO PARKING. HUMAN PERFORMANCE CONSIDERATIONS: WHILE I FELT FINE WHEN I STARTED THE FLT FROM SAN; I NOW KNOW THAT I MUST HAVE BEEN GETTING SICK EVEN THEN. THAT NIGHT; I CAME DOWN WITH SOME KIND OF FLU THAT KEPT ME IN BED FOR THE NEXT 2 DAYS; FEELING COMPLETELY EXHAUSTED AND UNABLE TO THINK CLRLY. I REALIZE NOW THAT I CANNOT HAVE BEEN THINKING CLRLY BY THE END OF THIS FLT; OR ELSE I EITHER WOULD NEVER HAVE LINED UP ON THE WRONG RWY AT THE HOME FIELD I KNOW SO WELL; OR I WOULD HAVE RECOGNIZED THE ERROR SOON ENOUGH TO CORRECT SAFELY. BEING HIGH AND FAST ON FINAL; IN RESPONSE TO ATC'S REQUEST TO MAINTAIN MAX FORWARD SPD; AND THE HAZE THAT MADE IT DIFFICULT TO SEE THE RWY LAYOUT CLRLY; WERE FACTORS THAT CONTRIBUTED TO MAKE THE APCH BUSIER THAN USUAL. I'M STILL SO STUNNED THAT I MADE SUCH A STUPID MISTAKE; I'M SURE THAT I'LL NEVER MAKE THIS MISTAKE AGAIN!