SMA ENTERS CLASS B AIRSPACE WITHOUT CLRNC WHILE TRANSITING VFR CORRIDOR.

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FROM SDM (BROWN FIELD SAN DIEGO) I INTENDED TO FOLLOW VFR CORRIDOR OVER NZY (NAVY N ISLAND) FOR SIGHTSEEING/CURRENCY FLT. NZY TWR DENIED REQUEST FOR FLY OVER AT 1500 FT MSL. I GLANCED AT MY VFR TERMINAL AREA CHART; READING 'VFR CORRIDOR 4500 FT AND BELOW.' I CONTACTED SAN (LINDBURG TWR) AND RPTED 'TRANSITING BAY S TO N AT 1500 FT.' I RPTED INTENTION TO EXECUTE A 180 DEG TURN AND PROCEED BACK S AT CORONADO BRIDGE; AND ASKED IF I NEEDED TO CONTACT NZY TWR. I DID; AND WAS TOLD TO STAND BY. MEANWHILE; I WAS PROCEEDING FURTHER NNW INTO THE SAN 12500/SURFACE AIRSPACE. NZY TWR CAME BACK UP; INFORMING ME I HAD INCURRED SAN CLASS B AIRSPACE. I SWITCHED TO SAN TWR AND APOLOGIZED; AND EXECUTED A L TURN TO S AT THE SAME TIME. SAN TWR; INFORMED ME TO SWITCH BACK TO NZY TWR; BECAUSE I WAS IN THEIR AIRSPACE NOW (CLASS D; I ASSUMED). I ALSO APOLOGIZED TO THEM FOR MY CONFUSION; AND PROCEEDED OUT OF CLASS D AIRSPACE. I BELIEVE SAN TWR APPROVED MY FURTHER FLT N BECAUSE THEY THOUGHT I WOULD EXECUTE MY 180 DEG TURN TO S AT THE CORONADO BRIDGE. WHEN I CALLED NZY TWR (NAVY) JUST AT/PAST THE BRIDGE; I GOT THE 'STAND BY' AND I ERRONEOUSLY CONTINUED MY COURSE INTO SAN CLASS B. MY INACTION: THIS WAS A CURRENCY FLT FOR ME; I HAD NOT CLOSELY STUDIED THE CHART FOR SOME TIME. I HAD ONLY INTENDED TO DO 3 TOUCH AND GO'S FOR THE DAY. MY UNFAMILIARITY WITH THE CHART AND MISREADING OF THE PROPER ALTS FOR THE VFR CORRIDOR CAUSED THIS INCURSION ON MY PART. THOUGH I WAS IN RADIO CONTACT WITH THE 2 TWRS; AND NO INTENT TO BREAK FAR'S EXISTED; MY POOR PREFLT PLANNING CAUSED MY MIS-NAV. POOR JUDGEMENT PLAYED A PART ALSO; SINCE I AM NOT VERY FAMILIAR WITH THE SAN DIEGO AIRSPACE; BUT STILL I DIDN'T PLAN THE FLT. THE MOST BEAUTIFUL DAY IN WEEKS LURED ME INTO THIS POORLY PLANNED; IMPROMPTU SIGHTSEEING TOUR.