AFTER 2 APCHS AT FOREIGN DEST ARPT AND A DIVERT TO AN ARPT NOT DESIRED BY HIS COMPANY DISPATCHER THE CAPT REMAINED UNDER PRESSURE FROM THE DISPATCHER TO RETURN TO THE DEST. CONSIDERING FURTHER OP; FOR VARIOUS REASONS; UNSAFE THE FLT WAS STOPPED AT THE DIVERSION ARPT.

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FLYING THE PARZA ARR INTO RWY 7 MROC; THE RWY WAS VISIBLE FROM 15 MI OUT. CLRED FOR THE ILS DME RWY 7; WE CONTINUED THE APCH. AT ROUGHLY 500 FT AGL; WE ENCOUNTERED A SCATTERED LAYER. AT 200 FT WE LOST VISUAL WITH THE RWY AND EXECUTED A MISSED APCH. WE FLEW THE PUBLISHED MISSED APCH. THE EASTERN PART OF THE ARPT AND RWY WERE VMC. SEEING THE CITY AND THE RWY; WE BELIEVED THAT THIS WAS A TEMPORARY PHENOMENA. WE ATTEMPTED ANOTHER ILS APCH TO RWY 7. THE CONDITIONS WORSENED AND WE EXECUTED ANOTHER MISSED APCH AT MINIMUMS. ON CLBOUT; THE CAPT'S FUEL ANALYSIS AND MINE AGREED -- ROUGHLY 5000 LBS AT OUR PLANNED ALTERNATE OF MSLP WITH NO UNPLANNED CONTINGENCIES. WX THERE WAS RPTED MARGINAL. WE ALSO CIRCUMNAVED NUMEROUS TSTMS IN THE VICINITY ON OUR WAY TO MROC. WE AGREED THAT FLYING THERE WOULD LEAVE US NO OPTIONS IF WE COULD NOT LAND OR ENCOUNTERED THE SAME STORMS WE CIRCUMNAVED EARLIER. MNMG WAS 70 MI OFF OUR NOSE AND WX THERE WAS RPTED VFR. WE 'ACARS'ED' DISPATCH WITH OUR INTENTIONS TO CHANGE OUR ALTERNATE. ALTHOUGH THEY WANTED US TO GO TO MSLP AND ASKED US TO DO SO I BELIEVE 2 SEPARATE TIMES; WE SAID THAT FUEL AND WX WOULD NOT ALLOW THIS. THEY SAID THEY WOULD MAKE THE NECESSARY ARRANGEMENTS AT MNMG. NEITHER THE CAPT NOR I HAD AN MNMG 11-1 PAGE EVEN THOUGH OUR PUBS WERE UP TO DATE AND WE HAD OTHER PAGES FROM THAT REVISION AS INDICATED IN THE FLT OPS MANUAL PAGE LOG. WE FLEW THE MNMG VOR ARR PROC AND THE VOR DME RWY 9 APCH. A LNDG WAS MADE WITHOUT INCIDENT. WE PARKED THE ACFT AND DID NOT PERMIT ANY PAX TO DEPLANE. THE CREW AND PAX WERE PROMPTLY BRIEFED. WE USED OUR SPANISH SPEAKING FLT ATTENDANT TO TRANSLATE INSTRUCTIONS TO THE FUELER WHO HAD DRIVEN A TRUCK TO THE PLANE. HE COULD NOT FUEL UNTIL ACR PROVIDED HIM WITH BILLING INFO. THE NEXT 2 HRS WERE CONSUMED TRYING TO ATTAIN BILLING INFO FROM DISPATCH VIA ACARS AND PHONE. AT ONE POINT; DISPATCH ASKED THE CAPT TO USE HIS CREDIT CARD TO PAY FOR THE FUEL. WE THEN RECEIVED A MESSAGE THAT ACR HAD AN AMEX CARD; BUT NOTHING MORE WAS RECEIVED AFTER THIS ISSUE WAS DELIVERED. AFTER ROUGHLY 2.5 HRS ON THE GND AT MNMG; THE CAPT INQUIRED WITH ME AND AS A CREW; WE DECIDED THAT IT WAS UNSAFE TO CONTINUE THE FLT FOR THE FOLLOWING REASONS: 1) CREW FATIGUE (20+ HRS AWAKE CAPT/FO). 2) NO PUBLISHED 10-3 PAGE. 3) NIGHT FLYING IN UNFAMILIAR MOUNTAINOUS TERRAIN. 4) RPTED MROC WX HAD NOT CHANGED AND INDICATED THE SAME CLOUD DECK -- 100 FEW -- AND A TEMP/DEWPOINT OF 20 DEGS/20 DEGS -- CALM WINDS. 5) WX IN MSLP STILL MARGINAL WITH SEVERE WX ENRTE. WHEN WE TOLD DISPATCH OF OUR INTENTIONS; THEY ASKED US TO CONTINUE TO MROC; THE WX WAS DECENT ENOUGH THEY SAID. WHEN THE CAPT USED THE 'UNSAFE' TERM WITH THE REASONS LISTED ABOVE IN OUR SECOND MESSAGE; THEY ASKED US TO RECONSIDER. THE CAPT THEN INDICATED THAT THE FLT IS TERMINATED.