O90 CTLR INCORRECTLY ASSUMES ACFT HDOF IS PROCEEDING TO SQL INSTEAD OF PLT'S MADE-KNOWN INTENTIONS OF OAK.

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I DEPARTED OAK ON A FLT WITH 2 PAX. I INFORMED THE CTLRS THAT WE WERE NWBOUND FOR A LCL TOUR. WHEN FINISHED; I NOTIFIED BAY APCH OF MY INTENTION TO RETURN TO OAKLAND; AND THEY TOLD ME TO CLB TO 2500 FT; FLY TO THE MORMON TEMPLE; THEN MAKE R TFC FOR RWY 27R (THE NORMAL PROC). AFTER REACHING THE TEMPLE; A DIFFERENT CTLR ISSUED INSTRUCTIONS TO FLY TO THE APCH END OF RWY 29; MAINTAIN 2000 FT AND PROCEED TOWARD THE SAN MATEO BRIDGE. THE CTLR WAS VERY BUSY AND I ASSUMED THIS ROUTING WAS THE RESULT. I DID AS INSTRUCTED; EXPECTING FURTHER INSTRUCTIONS; WHEN THE CTLR CALLED (PARAPHRASING) 'DSND TO 1400 FT; RADAR SVC TERMINATED; SQUAWK VFR.' I ASKED WHAT WAS GOING ON. THE CTLR ASKED 'YOU'RE LNDG AT SAN CARLOS; RIGHT?' I REPLIED NO; I WAS LNDG AT OAKLAND. HE TOLD ME TO DO A 180 DEG TURN; DSND TO 1400 FT; AND CALL THE TWR. HE ALSO SAID I WAS IN CLASS B AIRSPACE. I DO NOT KNOW FOR SURE THAT I WAS. I BELIEVE THE PRIMARY ERROR WAS THE CTLR'S IN NOT HANDING ME OFF PROPERLY OR VERIFYING MY DEST. HOWEVER; AS I WAS IN THE VICINITY OF MY DEST ARPT; I WAS NOT ADEQUATELY MONITORING MY POS RELATIVE TO THE SFO CLASS B AIRSPACE. I WAS EXPECTING TO BE TURNED BACK TO OAKLAND MOMENTARILY. WHEN I RECEIVED THE REROUTING; I COULD HAVE QUESTIONED IT; AND RESOLVED THE SIT THEN.