FLC TAXIED OFF TXWY INTO THE GRASS.

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WE WERE OPERATING XXX FLT; CVG TO GRR ON APR/XX/95. WE LANDED UNEVENTFULLY ON RWY 8R AT APPROX XA30 LCL. IT WAS MY LEG AND I WAS OPERATING THE ACFT THE ENTIRE TIME. WE EXITED THE RWY AT TXWY A-3; MAKING A L TURN. THE ACFT WAS UNDER CTL AND AT A NORMAL TAXI SPD. HAVING BEEN INTO GRR ON SEVERAL OCCASIONS; I WAS AWARE THAT THERE WERE 2 PARALLEL TXWYS. THE TXWY CLOSEST TO THE RWY DOES NOT RUN FULL LENGTH AND I WAS LOOKING FOR THE SECOND TXWY WHICH RUNS FULL LENGTH; TO GET TO THE RAMP AREA. FROM THE ARPT DIAGRAM; THERE APPEARED TO BE A SHORT STUB TXWY WHICH WOULD ALLOW ME TO ACCOMPLISH THIS AND I WAS LOOKING FOR IT AS WE BEGAN TO ACCOMPLISH THE AFTER LNDG CHKLIST. AFTER ACCOMPLISHING A COUPLE OF CHKLIST ITEMS; I LOOKED UP AND NOTICED THAT THE ACFT WAS HDG FOR A GRASSY AREA. I IMMEDIATELY BROUGHT THE ACFT TO A HALT; STILL ON THE TXWY. FROM MY OBSERVATION IT LOOKED AS IF I COULD MAKE A HARD L TURN AND REMAIN ON THE TXWY. I TURNED THE WHEEL; ADDING PWR AND THE ACFT DEPARTED THE PREPARED SURFACE. THE TWR AND CGP WERE NOTIFIED. BUSES WERE DISPATCHED AND THE PAX EXITED THE ACFT THROUGH THE AFT STAIRS WITHOUT INCIDENT. THE KEY LESSONS TAKEN AWAY FROM THIS EXPERIENCE ARE THAT IF YOU ARE UNSURE OF YOUR POS; STOP UNTIL YOU FIGURE IT OUT; AND IF YOU FIND YOURSELF IN A SIT WHERE MANEUVERING SPACE IS LIMITED; STOP AND CALL THE GND CREW FOR HELP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS TAXIING THE MD-88 WHEN HE WENT OFF THE TXWY. THE CHART HE WAS COMPLAINING ABOUT IN THIS RPT THAT MISLEAD HIM HAS SINCE BEEN REVISED TO CORRECT THE PROB SATISFACTORILY.