AN ACR ACFT LANDING ON LGB RWY 30 EXITED ON RWY 7L/25R AND HELD ON THE ACTIVE RWY CAUSING AN ACFT TO GAR.

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LANDED ON RWY 30 AT LGB AFTER BEING CLRED TO LAND BY LGB TWR. I HAD PLANNED ON EXITING THE RWY 30 AT TXWY K TO GO TO THE ACR RAMP. THE PF (FO) LANDED A LITTLE LONG AND WE COULD NOT MAKE TXWY K WHICH IS A REVERSE TURN KIND OF EXIT. WE EXITED ON RWY 34L/K AREA BUT IN THE RWY AREA OF RWY 25R. WITH NO PLACE TO GO WE CONTACTED GND CTL WHILE STOPPED AT RWYS 34L/25R/30/K AREA. LGB INSTRUCTED OR INFORMED US THAT WE WERE ON AN ACTIVE RWY AND AN ACFT WAS GOING AROUND BECAUSE OF THAT. I THINK THE ACFT WAS ON APCH TO RWY 25R BUT I AM NOT SURE-- MAYBE RWY 34L? THIS LGB ARPT IS VERY CONFUSING AND WITH MULTIPLE RWYS IN USE WITH NUMEROUS ACFT TYPES THE POTENTIAL FOR UNSAFE SITS IS VERY HIGH WITH REGARD TO RWY INCURSIONS. SUGGESTIONS: 1) BETTER BRIEF OF PLANNED RWY EXIT AFTER LNDG. 2) MORE COM WITH TWR -- PLANNED EXIT; NOT JUST A 'CONTACT GND WHEN CLR.' 3) BE AWARE OF LNDG TFC ON INTERSECTING RWYS WITHOUT LAHSO CLRNC. 4) HOTSPOTS ARE NOT MARKED AS SUCH AS LGB COMMERCIAL CHART. 5) BETTER RWY EXIT POINTS FOR LARGE ACFT OPS.