PVT PLT OF AN SMA SEL FAILED TO FOLLOW ATC CLRNCS ON 2 DIFFERENT TIMES WHILE ON IFR FLT PLAN AT NIGHT.

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HALFWAY THROUGH AN IFR FLT FROM SIERRA BLANCA; NM; TO ARLINGTON; TX; IT WAS DETERMINED THAT WX AT ARLINGTON WAS BAD AND I REQUESTED RTING TO MIDLAND INTL TO PUT DOWN FOR THE NIGHT. ZFW ASSIGNED AN INITIAL HDG OF 165 DEGS; THEN LATER CLRED ME TO DIRECT MAF VOR AND TRANSFERRED ME TO MIDLAND APCH. I CONTINUED TO FLY THE 165 DEG HDG WHILE MIDLAND APCH GAVE ME LOWER ALTS. ALTHOUGH IT WAS GOOD VFR (NIGHT); I HAD TROUBLE LOCATING THE ARPT VISUALLY AND WAS BUSY WITH CHARTS AND GPS. I FORGOT TO TRACK DIRECTLY TO THE VOR AS PREVIOUSLY ASSIGNED AND WAS NOTIFIED BY CTLR OF MY DEV. NO OTHER ACFT WERE IN THE AREA AT THE TIME. THEN; AFTER BEING CLRED FOR A VISUAL L DOWNWIND TO RWY 34L; I FLEW THE L DOWNWIND APCH TO RWY 28. TWR INQUIRED IF I KNEW WHERE I WAS GOING AND I IMMEDIATELY RECOGNIZED MY ERROR. A 270 DEG TURN TO THE R PUT ME ON SHORT FINAL. AGAIN; NO OTHER ACFT WERE IN THE AREA. MINOR FACTORS: UNFAMILIAR ARPT; NIGHT; RWY 28 WAS VERY VISIBLE WITH BRIGHT LIGHTING. MAJOR FACTORS: PLT FATIGUE -- PLT HAD SPENT THE DAY SKIING (3 1/2 HRS); CHKING OUT OF HOTEL; RETURNING RENTAL SKIS AND RENTAL CAR; FLT PLANNING; LOADING ACFT; ETC. -- BUSY DAY. NEXT TIME I WILL NOT TRY TO SKI AND FLY A LONG-DISTANCE; IFR FLT IN THE SAME DAY. XCHK COMPASS AND RWY ALIGNMENT; EVEN WHEN I THINK I KNOW WHICH RWY IS CORRECT.