VFR ARR TO PRC DESCRIBED TFC PATTERN EVENT WHEN EVASIVE ACTION WAS REQUIRED TO COMPLY WITH ATC CLRNC AND TO AVOID TERRAIN AND TFC.

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APCHED PRC FROM W. TOLD TO ENTER AND CALL ON A 6 MI 45 TO L DOWNWIND RWY 30. COULD NOT CALL AT 6 MI OUT DUE TO NONSTOP CHATTER ON RADIO. GOT A CALL OFF ABOUT 4 MI OUT. TOLD TO RPT DOWNWIND ABEAM TWR. BEFORE REACHING DOWNWIND ABEAM TWR; WAS TOLD TO FLY WIDE L DOWNWIND FOR TFC. WIDE L DOWNWIND PUTS ACFT HEADED STRAIGHT FOR GLASSFORD HILL 6168 FT -- TPA IS 6000 FT. TOLD AGAIN TO RPT DOWNWIND ABEAM TWR. AGAIN RADIO CHATTER PREVENTED RPTED DOWNWIND ABEAM TWR -- FIRST BREAK IN RADIO OUR ACFT WAS ALREADY PAST THE APCH END. TOLD TO STAY ON DOWNWIND AND TWR WOULD CALL BASE. TWR WAS TALKING ABOUT A CHEROKEE ON FINAL BUT WE SAW A HIGH WING AIRPLANE ON FINAL AND SEMINOLE ON R DOWNWIND JUST AHEAD OF US. I BELIEVE TWR TOLD US WE WERE #3 AFTER THE SEMINOLE AND STUDENT BEGAN TO TURN L BASE BUT THERE WAS THE OTHER ACFT ON FINAL AND WE WOULD HAVE TURNED INTO THEM HAD WE TURNED BASE; AND AT THIS POINT WE WERE GOING TO HIT THE MOUNTAIN IF WE CONTINUED STRAIGHT; SO I GRABBED THE CTLS AND BEGAN A R 360 DEG TURN AND TOLD TWR WE HAD TO MAKE A 360 DEG TURN AND COULDN'T TURN BASE BECAUSE OF OTHER ACFT AND MOUNTAIN WAS IN FRONT. AS WE GOT THROUGH 180 DEGS OF THE 360 DEG TURN; I COULD SEE TWR HAD ANOTHER ACFT RIGHT BEHIND US ON DOWNWIND AS WELL. TWR HAD ESSENTIALLY BOTTLENECKED ABOUT 5 ACFT WITH THOSE OF US ON THE L DOWNWIND HAVING A MOUNTAIN RIGHT IN FRONT. BY THE TIME I SAW THE ACFT BEHIND US WE HAD ALREADY GOTTEN THROUGH 180 DEGS; SO I ELECTED TO CONTINUE THE TURN AND COULD SEE THE AIRPLANE BEHIND US WAS ALSO TURNING R TO WIDEN OUT AND AVOID US. AS WE ROLLED OUT OF 270 DEGS OF THE 360 DEG TURN; TWR TOLD US TO GO RIGHT INTO BASE AND FOLLOW THE SEMINOLE. THE SEMINOLE AT THIS POINT WAS DIRECTLY IN FRONT OF US; WING UP TURNING FINAL. THERE WAS NO WAY TO FOLLOW THIS ACFT WITHOUT HITTING IT OR THE MOUNTAIN; SO I TOLD ATC NEGATIVE AND CONTINUED OUR TURN FOR ANOTHER 360 DEG TURN AS I FELT WE WERE BOXED IN AT THIS POINT WITH A MOUNTAIN IN FRONT; SEMINOLE ON L; AND ANOTHER AIRPLANE THAT WAS ON WIDE DOWNWIND BEHIND US. TWR TOLD US TO NOT DO A 360 DEG TURN AND FLY SEBOUND AND CONTACT A DIFFERENT TWR FREQ. UNFORTUNATELY; THESE INSTRUCTIONS PUT US HEADED FOR A COLLISION WITH THE ACFT THAT WAS IN THE WIDE DOWNWIND. WE VISUALLY MADE TURNS TO AVOID THIS OTHER ACFT AND THEN CONTACTED THE OTHER TWR FREQ WHO THEN TOLD US TO FLY 6 MI SE AND CLB TO 6500 FT AND COME BACK IN FOR A STRAIGHT-IN FOR RWY 30. THIS RTE TOOK US OUT AND AROUND GLASSFORD HILL (SO WE WOULDN'T HIT IT). UPON RETURN TO THE FLT SCHOOL; THE SCHOOL HAD RECEIVED A CALL FROM THE TWR; UPSET THAT I HAD INITIATED THE R 360 DEG TURN. I FELT I HAD NO OTHER CHOICE UNLESS I RISKED AN IMMEDIATE CLB ABOVE THE MOUNTAIN AND ABOVE THE TPA WHICH WOULD ALSO BE A VIOLATION. SOME OF OUR ACFT JUST DON'T HAVE THE PWR AT THIS ALT TO MAKE A QUICK CLB LIKE THAT AND UNLESS THERE IS ENOUGH SPACE I DON'T FEEL THAT THAT IS A RISK I SHOULD TAKE. IT CERTAINLY WOULD MAKE MORE SENSE AT PRC ON THE FEW OCCASIONS THAT RWY 30 IS IN USE THAT R TFC ONLY IS USED DUE TO GLASSFORD HILL BEING ABOVE TPA AND BEING RIGHT AT THE END OF THE L DOWNWIND; ESPECIALLY A WIDE DOWNWIND AS WE WERE INSTRUCTED TO FLY. MY ONLY CHOICES DURING THIS EVENT WERE TO TRY TO CLB AND FLY OVER GLASSFORD HILL; OR TO MAKE THE R 360 DEG TURN WHICH INCIDENTALLY IS WHAT PRESCOTT TWR USUALLY REQUESTS US TO DO WHEN IN A L DOWNWIND FOR RWY 30 AND THEY NEED MORE SPACING. I COULD NOT COMPLY WITH ANY OTHER OF THEIR INSTRUCTIONS WITHOUT HITTING ANOTHER ACFT OR THE MOUNTAIN.