C172 PLT MAKES QUICK EXIT FROM RWY WHEN NOTICING ANOTHER ACFT STARTING TKOF ROLL FROM THE OTHER END OF THE RWY COMING TOWARD HIM AT AN UNCTLED ARPT.

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I TOOK OFF FROM RNT; WA; WITH A SLIGHTLY NERVOUS PAX (ON HER SECOND GA FLT) FOR A 'FLT-SEEING' TOUR OF THE SAN JUAN ISLANDS. THE FORECAST WX WAS FOR AREAS OF SCATTERED CLOUDS AROUND 4000 FT TO BURN OFF IN THE LATE MORNING; LEAVING HIGH CIRRUS ABOVE; AND LIGHT N SURFACE WINDS (UNDER 10 KTS) ALONG THE RTE OF FLT; THROUGH EARLY EVENING. THAT IS WHAT WE SAW. IDEAL FLYING WX; WITHOUT THE BLUE SKIES FOR TRULY STUNNING PHOTOGRAPHS. AFTER VIEWING LOPEZ AND ORCAS ISLANDS; I HEADED FOR ROCHE HARBOR; WHERE I POINTED OUT THE HARBOR AND RESTAURANT BEFORE FOLLOWING THE COASTLINE E TO INTERCEPT THE NDB FOR A STRAIGHT-IN APCH TO RWY 34. I RECHKED THE ASOS ABOUT 10 DEGS BEFORE MY INTERCEPT; THEN RETURNED TO CTAF WHERE I COULD HEAR 1 ACFT DEPARTING ON RWY 34; AND ANOTHER MANEUVERING FOR THE 45 DEG ENTRY TO RWY 34. I ANNOUNCED THAT I WAS MANEUVERING FOR A STRAIGHT-IN ENTRY TO RWY 34 AT THE COASTLINE. I CROSSED THE COASTLINE; ANNOUNCED I WAS 1100 FT STRAIGHT-IN FOR RWY 34; AND BEGAN MY DSCNT. I EXPLAINED THE THERMALS TO MY PAX; WATCHED THE DEPARTING TFC TURN XWIND; AND KEPT ABOUT 10 KTS EXTRA SPD FOR PAX COMFORT AS I KNEW I HAD LOTS OF RWY. I HEARD THE OTHER TFC TURNING DOWNWIND. AS I DSNDED THROUGH 400 FT; THE VASI TURNED WHITE/WHITE; SO I ANNOUNCED I WAS SHORT FINAL FOR RWY 34 AND GOT BUSY ABOUT LOSING SOME ALT. THE TFC BEHIND ME ANNOUNCED HIS POS AND INTENTION TO LAND ON RWY 34. THEN A STATION AIR ANNOUNCED HE WAS READY FOR TKOF ON RWY 16. I GLANCED UP TO SEE HIM AT THE HOLD LINE; THEN FLARED AND LANDED. THEN I LOOKED UP TO SEE THE STATION AIR TAXI ONTO THE RWY; ROLLING TOWARDS ME. I PROMPTLY ANNOUNCED THAT I WAS ON THE RWY; AND SLOWED RAPIDLY. THE STATION AIR DID A 180 DEG TURN AND HEADED FOR THE TXWY. I WAS ABLE TO EXIT AT MIDFIELD. AS I TAXIED OFF THE RWY; I ANNOUNCED THAT HE WAS OK; I WAS OFF AT MIDFIELD. HE CALLED BACK AND APOLOGIZED. HE SAID HE DID NOT HEAR MY POS ANNOUNCEMENTS. HE THEN TAXIED TO RWY 34; AND DEPARTED AFTER THE ARRIVING TFC HAD LANDED.