CAPT OF AN ACR MLG INADVERTENTLY TAXIED ACROSS AN ACTIVE RWY WITHOUT CLRNC.

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I HAVE FLOWN OUT OF HOBBY FOR THE LAST 25 YRS. I'VE FLOWN FOR THIS AIRLINE FOR THE LAST 6 YRS AND CORP FOR 18 YRS PRIOR. IF YOU THINK YOU KNOW AN ARPT; WE ALL NEED TO THINK TWICE. WE WERE CLRED TO HOLD SHORT OF RWY 4 AT INTXN C. AFTER ACFT LANDED; WAS CLRED TO CROSS RWY 4; TAXI TO RWY 31L VIA TXWY C. TXWY C; NOW MAKE A HARD L- HAND TURN AND GO TO THE N SIDE OF RWY 30R. BEING CLRED TO RWY 30L; I JUST KNEW I COULD CROSS RWY 30R WITHOUT ANY PROBS. NOT THINKING AND HEAD UP AND LOCKED; I MADE A R- HAND TURN ONTO TXWY K; CROSSED RWY 30R AND L-HAND ON TXWY M. MY FO SAID SOMETHING; BUT IT DIDN'T REGISTER! I ASKED GND IF THERE WOULD BE A PROB; AND THEY SAID NO. I DID LOOK BOTH WAYS BEFORE XING AND NO ONE WAS TAKING OFF OR LNDG. BUT THAT DOESN'T DO A LOT OF GOOD IF YOU DON'T HAVE CLRNC. WE WERE IN THE MIDDLE OF THE CHKLIST WHEN WE CROSSED. TRYING TO TAXI; LOOK WHERE YOU'RE GOING AND DOING A CHKLIST CAN SOMETIMES BE DISTRACTING. I'LL CHOOSE NOT TO RUN THE CHKLIST UNTIL ALL RWYS ARE CROSSED AND WE'RE GOING STRAIGHT. JUST GOES TO SHOW; THAT EVEN SOMEONE WITH MY TIME IN AND OUT OF THIS ARPT; CAN MAKE MISTAKES.