MU-2 PLT TAXIES ACROSS ACTIVE RWY WITHOUT CLRNC. NO TRAFFIC CONFLICT.

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PRIOR TO ARR; I SPENT SEVERAL MINS STUDYING THE TAXI RTES AND KNEW WHERE CUSTOMS WAS. I FLEW A NORMAL ILS APCH TO RWY 3R; CLRED THE RWY AT W-3; AND WAS INSTRUCTED BY TWR TO TURN NBOUND ONTO TXWY W AND CONTACT GND. I INFORMED GND THAT I WAS UNFAMILIAR WITH THE ARPT AND NEEDED TO GO TO CUSTOMS. I HAD THE TAXI DIAGRAM ON MY LAP AT THE TIME. GND INSTRUCTED ME TO TAXI N ON TXWY W; HOLD SHORT OF TXWY V. I COMPLIED AS INSTRUCTED; BUT PROBABLY STOPPED JUST PAST THE SIGN MARKING THE INTXN OF TXWYS W; V; AND P-4; IN AN ATTEMPT TO TAXI PAST THE OFF DUTY RWYS 9L/27R. WHILE HOLDING SHORT OF TXWY V; GND CLRED ME TO TAXI N ON P-4 TO TXWY P; AND CALL A VISUAL ON THE MCDONALD'S SIGN. GND INFORMED ME SOMEWHERE IN THE PROCESS THAT P-4 WAS WIDE AND AN EX-RWY; IN ORDER TO HELP ME WITH THE IDENT. NEVERTHELESS; I DID NOT SEE ANY MARKINGS FOR P-4; MISSED THE TURN; AND CONTINUED N ON TXWY W. NEXT; I CAME TO A R TURN AT THE END OF TXWY W AND REALIZED THAT I HAD MISSED THE TURN ONTO P-4. I PROCEEDED TO TURN AROUND TO THE R AND; KNOWING THAT I HAD JUST TAXIED ACROSS OFF DUTY RWYS 9L/27R; ASSUMED THAT THE RWY IN FRONT OF ME WAS RWYS 9L/27R; WHICH I PROCEEDED TO CROSS. I WAS OBVIOUSLY CONFUSED AT THIS POINT. IN FACT; I CROSSED RWYS 3R/27L; AN ACTIVE RWY AT THE DEP END; AND ENDED UP ON TXWY V ON THE E SIDE OF RWY 3R. THIS WAS WHEN I FIRST REALIZED THAT I HAD CROSSED RWY 3R. I CALLED GND; TOLD HIM I HAD MISSED THE TURN; AND WAS INSTRUCTED TO HOLD SHORT OF RWY 3R; WHICH I COMPLIED WITH. GND NEXT CLRED ME ACROSS RWY 3R; TO P-4; WHICH I SAW THIS TIME; AND THE REMAINDER OF THE TAXI IN WAS UNEVENTFUL. I CALLED THE TWR AS INSTRUCTED AFTER CUSTOMS. ON THAT CALL; THE CTLR ADVISED THAT THEY HAD NO CONFLICT ALERTS IN THE TWR. CONTRIBUTING FACTORS WERE: 1) UNFAMILIAR ARPT; WITH COMPLEX TAXI RTES AND HIGH TFC VOLUMES. 2) SINGLE PLT OP. 3) PREVIOUS HIGH WORKLOAD DUE TO LOW WX. 4) FAILURE TO RPT MISSING THE TURN ONTO P-4 IMMEDIATELY TO GND. 5) TXWY P-4 WAS NOT MARKED SEPARATELY AT THE INTXN PAST TXWY V; BUT WAS GROUPED TOGETHER WITH THE TXWY V INTXN ON THE S SIDE OF TXWY V. A SEPARATE SIGN N OF TXWY V BTWN TXWY V AND P-4 COULD BE INSTALLED; MAKING IT EASIER TO IDENT THE TURN. CORRECTIVE ACTIONS INCLUDE: 1) I CHOSE DTW AS A DEST BASED ON CUSTOMS AVAILABILITY. WE WERE IMPORTING THE AIRPLANE AND THE CUSTOMS BROKER WAS LOCATED NEAR DTW. I ELECTED TO USE THAT ARPT FOR CUSTOMS CONVENIENCE. I SHOULD HAVE HAD THE CUSTOMS BROKER SET IT UP FOR DETROIT CITY OR WILLOW RUN; WHICH DON'T HAVE THE TFC DENSITY AND ARE BETTER SUITED TO SINGLE PLT OPS. I HAVE FLOWN INTO HIGH TFC ARPTS IN THE PAST; BUT ALWAYS AS PART OF A 2 PLT CREW. I WILL NOT FLY SINGLE PLT INTO ARPTS SUCH AS DTW OR ORD OR JFK AGAIN. FRANKLY; TAXIING AT THESE COMPLEX ARPTS IS THE MOST DIFFICULT THING I'VE HAD TO PERFORM IN AVIATION. 2) ONCE I MISSED THE TURN FOR P-4; I SHOULD HAVE STOPPED AND ASKED FOR HELP. 3) PRIOR TO TAXIING ACROSS RWY 3R; A SIMPLE CHK OF THE COMPASS WOULD HAVE CONFIRMED THAT THE RWY WAS NOT RWYS 9L/27R. 4) IF I WAS NOT ABSOLUTELY CERTAIN OF THE RWY I WAS FACING (NO ASSUMPTIONS); I SHOULD HAVE STOPPED AND ASKED FOR CLRNC. 5) REJECTING THE 'MACHO' REACTION ('I CAN DEAL WITH THIS') WOULD HAVE PREVENTED THE INCURSION.