THE PLT OF A LAKE 4-200 WAS CLRED TO TAXI TO BUT HOLD SHORT OF A RWY ENRTE THE ENG RUN-UP AREA. THE PLT CROSSED THE ACTIVE RWY.

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I WAS PARKED AT THE FBO. THE FBO HAS LIMITED SPACE TO OPERATE; ESPECIALLY ON WEEKENDS. ON TOP OF ALL OF THAT; TO GET TO THE RUN-UP AREA FOR RWY 6; YOU MUST FIRST CROSS RWY 6. I CALLED GND CTL AND WAS CLRED TO TAXI TO RWY 6 LOCATED JUST A COUPLE HUNDRED FT AWAY FROM WHERE I WAS PARKED. AFTER MANEUVERING AROUND SEVERAL PARKED ACFT; I CONTINUED STRAIGHT AHEAD FOLLOWING ANOTHER ACFT THAT WAS CLRED TO 'THE RUN-UP AREA' JUST BEFORE I CALLED GND CTL. BEFORE I KNEW IT; GND CTL WAS CONTACTING ME AND TELLING ME THAT I HAD JUST CROSSED OVER RWY 6 WITHOUT AUTH. HE TOLD ME TO CONTINUE TO THE RUN-UP AREA ANYWAY AND I APOLOGIZED AND TOLD THE CTLR THAT I THOUGHT I WAS CLRED TO THE RUN-UP AREA. HE EXPLAINED THAT I WAS CLRED ONLY TO RWY 6. THERE WERE NO OTHER ACFT AT RISK (NONE ON FINAL) AND THE INCIDENT ENDED THERE. I BELIEVE THERE WERE 2 REASONS WHY THIS HAPPENED TO ME. FIRST; WHEN I FIRST SWITCHED OVER TO GND CTL; ANOTHER ACFT WAS FINISHING THEIR CLRNC TO 'THE RUN-UP AREA.' WHEN THE CTLR ISSUED MY INSTRUCTION TO TAXI TO RWY 6; I INTERPED THAT AS CLRED TO THE 'RUN-UP AREA' AND PROCEEDED WITHOUT THINKING ABOUT THE FACT THAT I WAS GOING TO CROSS AN OPERATIONAL RWY IN THE PROCESS. SECONDLY; I CONTINUED NOT TO GRASP THE FACT THAT I WAS XING AN OPERATIONAL RWY AS I WAS DISTR BY THE OTHER PARKED ACFT. I WAS MANEUVERING AROUND AND NOT PAYING FULL ATTN TO THE GND MARKINGS THAT INDICATED THE RWY HOLD SHORT LINE. THERE ARE 2 THINGS THAT WOULD HELP THIS SIT IN THE FUTURE. THE FIRST IS VERY OBVIOUS; IN HINDSIGHT. I NEED TO PAY CLOSER ATTN TO OPS AT UNFAMILIAR ARPTS AND NOT BE DISTR BY OTHER ACFT. SECONDLY; SINCE THIS ARPT IS SOMEWHAT UNIQUE IN THAT ALL ACFT THAT NEED TO PERFORM A RUN-UP; MUST FIRST XOVER TO GET TO THE RUN-UP AREA. WHEN RWY 6 IS IN USE; THE CTLR SHOULD BE TRAINED TO INCLUDE A SIMPLE 'HOLD SHORT OF RWY 6' INSTRUCTION AT THE END OF THEIR CLRNC FOR TAXIING INSTRUCTIONS TO RWY 6. I STRONGLY BELIEVE THAT THIS WOULD HAVE MADE ME MUCH MORE ALERT TO THE FACT THAT THERE IS SOMETHING UNIQUE OR DIFFERENT ABOUT THIS SIT THAN WHAT I HAVE SEEN BEFORE. I BELIEVE THAT IT WOULD INCREASE SAFETY.