NMAC BTWN AN ACR MLG AND A HANG GLIDER IN PROX OF ARSA CLASS C AIRSPACE.

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ON A VECTOR FROM THE N IN A L BANK TO INTERCEPT THE ILS 9L LOC AT PBI WHILE TURNING AROUND SOME CLOUDS. IN THE TURN I NOTICED A HANG GLIDER DIRECTLY IN FRONT IN OUR FLT PATH AND MADE A CORRECTION TO THE R TO AVOID A COLLISION. THE HANG GLIDER WAS CO-ALT AT 4200 FT; ON THE CTRLINE OF THE ILS 9L APCH AT ABOUT 15 MI. WE CONTINUED THE APCH WITHOUT INCIDENT AND RPTED THE HANG GLIDER TO APCH CTL AND AFTER LNDG TO GND CTL. I CALLED GND CTL AFTER DEBOARDING OUR PAX: SOME OF WHICH HAD SEEN THE HANG GLIDER ALSO; AND FILED A RPT WITH HIM. DURING THE CONVERSATION IT WAS OBVIOUS THAT IT WAS A 'REGULAR' OCCURRENCE AT THAT LOCATION AND THAT THERE WASN'T MUCH THAT COULD BE DONE. I DON'T THINK WE SHOULD WAIT UNTIL SOMETHING BAD HAPPENS BEFORE ACTION CAN BE TAKEN AND I BELIEVE THAT HERE IS A PERFECT EXAMPLE OF SOMETHING WE CAN PREVENT FROM HAPPENING. I'M CERTAIN NEXT WKEND OTHER HANG GLIDERS WILL BE EXACTLY AT THE SAME LOCATION AND OTHER AIRLINERS WILL BE THERE TOO. THIS SIT IS WELL KNOWN BY THE LCL CTLRS; BUT NO NOTAM OR ADVISORY WAS ISSUED ABOUT THIS. THIS NEEDS TO BE CHANGED. I'M FLYING THIS EXACT ROTATION THE REST OF THE MONTH AND I'LL BE LOOKING FOR SOME NOTAMS OR ADVISORIES CONCERNING THIS.