B737 CREW ON APCH TO SAN FAIL TO OBTAIN LNDG CLRNC. CREW BECAME DISTR WHEN A DH6 RELEASED JUMPERS NEAR THEIR FLT PATH.

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WHILE BEING GIVEN A VECTOR BY APCH TO THE LOC RWY 27 FINAL APCH COURSE; APCH CTLR POINTED OUT 10 O'CLOCK POS TFC (DH TWIN OTTER) 1.5-2 MI (SAME DIRECTION). THE TFC WAS SPOTTED BY THE CAPT AND MYSELF; TO OUR SURPRISE WHILE LOOKING AT THE TFC APPROX 7-10 SKYDIVERS EXITED THE ACFT. WE HEARD NO CALL FROM THE JUMP ACFT; NOR WERE WE ALERTED BY APCH CTL; WHEN AT THE TIME WAS EXTREMELY BUSY. THE CAPT KEPT A CONCERNED VISUAL ON THE JUMPERS AND THE JUMP ACFT AS IT MADE ITS RAPID DSCNT; I CONTINUED FLYING THE ACFT AND LISTENING TO HOW BUSY ATC WAS. ONCE THE CAPT WAS COMFORTABLE THAT THERE WAS NO CONFLICT; HE RETURNED HIS ATTN BACK INSIDE THE ACFT. I DO NOT REMEMBER HEARING ANY HDOF TO TWR; BUT BECAUSE OF THE PREVIOUS DISTR WE DID NOT SWITCH TO TWR. WE LANDED UNEVENTFULLY AND DURING TAXI OFF THE ACTIVE RWY; WE DISCOVERED THAT WE WERE STILL ON APCH CTL. I CONTACTED TWR TELLING HIM WE WERE EXITING THE RWY AND TWR HANDED US OFF TO GND CTL WITH NO QUESTIONS. ONCE ON GND CTL WE WERE CLRED INTO OUR GATE. IN RETROSPECT I FEEL WHEN THE CAPT WAS WATCHING THE JUMPERS AND ACFT WE SHOULD BOTH QUICKLY BRIEF WHO IS TO HANDLE THE RADIO OR BACK EACH OTHER UP ON THE RADIO. WE SHOULD HAVE ALSO EXPECTED SOMETHING OR RADIO CALL FROM THE JUMP ACFT ABOUT THE PLANNED JUMP. IN ADDITION; WE SHOULD HAVE QUESTIONED ATC ABOUT THE JUMP ACFT (EVEN THOUGH HE WAS EXTREMELY BUSY) AND ASKED FOR A HDOF TO TWR.