LJ25 PLT DEVIATED FROM THE CHARTED LDA-1 RWY 8 APCH TRACK AND ENCOUNTERED HIGH TERRAIN AT NIGHT AT JNU.

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FLYING INTO JNU; AK; AT NIGHT; AND CLRED FOR THE LDA APCH INTO JNU ARPT. THE FINAL APCH COURSE IS OFFSET FROM THE RWY CTRLINE SO ACFT APCH FROM THE SW AND AVOID RISING TERRAIN N AND W OF THE RWY. THE MDA OF THE APCH WAS GREATER THAN 2500 FT AGL; AND THE MISSED APCH WAS GREATER THAN 2 MI FROM THE RWY END. INSTRUCTIONS INDICATED TO FLY VISUALLY FROM MISSED APCH TO ARPT. OUR APCH STARTED IMC AND BECAME VISUAL APPROX 5 MI OUT. I HAD REVIEWED THE PLATES FOR TERRAIN. MOST OF THE NOTES WERE ABOUT RISING TERRAIN N OF RWY; NO CIRCLING N WARNINGS; AND MISSED APCH INSTRUCTIONS DEPICTED DUE TO RISING TERRAIN E OF RWY. I SAW OBSTACLES (TERRAIN) JUST N OF THE CTRLINE OF RWY; AND ASSUMED A HIGH AND SLIGHTLY SOUTHERLY APCH WOULD KEEP ME CLR OF TERRAIN. THE MISTAKE I MADE WAS WE BECAME VMC 5 MI OUT ON THE APCH; AND WITH THE RWY IN SIGHT ABANDONED THE LDA COURSE; AND MOVED CLOSER TO A STRAIGHT-IN APCH. ON SHORT FINAL; I FOUND MYSELF CLOSE TO RISING TERRAIN NEAR THE APCH END OF THE RWY. I HAD TO MAKE A LAST MIN COURSE CORRECTION TO S OF THE RWY CTRLINE TO AVOID RISING TERRAIN. I SHOULD HAVE NEVER ABANDONED THE LDA APCH JUST BECAUSE I WAS VISUAL WITH LOTS OF VISIBILITY. I SHOULD HAVE FLOWN THE LDA TO MISSED APCH POINT AND PROCEEDED VISUALLY TO THE THRESHOLD FROM THE SW. I SHOULD HAVE REVIEWED VFR CHARTS PRIOR TO ABANDONING AN LOA COURSE IN VFR CONDITIONS. I WOULD HAVE REALIZED THAT A NEAR STRAIGHT-IN APCH IS TOO CLOSE TO TERRAIN. THE IFR APCH CHARTS ADDRESSED MANY WARNINGS; BUT NOT SPECIFIC WARNINGS OF HIGH TERRAIN; MAKING NEAR STRAIGHT-IN OR SLIGHTLY OFFSET VISUAL APCHS DIFFICULT DUE TO HIGHER TERRAIN NEAR APCH END OF RWY.