SMA TXWY EXCURSION HIT RWY SIGN. ACFT DAMAGE.

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SMA X FROM SD TO FLYING CLOUD ARPT; MN. ACFT LNDG LIGHT FAILED IN FLT. LNDG WAS MADE WITH NO PROB ON RWY 27L. TAXIED OFF RWY AND HAD A SHORT DELAY ON TXWY TO LOOK UP THE FBO TO WHICH WE NEEDED TAXI DIRECTIONS. WE WERE GIVEN TAXI DIRECTIONS TO FBO AVIATION BY TAXIING E ALONG RWY 27L-9R; ACROSS RWY 36; L TURN TO THE N ACROSS RWY 27L; PAST THE WINDSOCK AND TO THE RAMP. WHEN GOING ACROSS RWY 27L THE TXWY WAS ONLY LIT BY 2 BLUE LIGHTS IMMEDIATELY ON THE N SIDE; OR ADJACENT TO RWY 27L. NO OTHER TXWY LIGHTS WERE PROVIDED FOR THE NEXT 600-700 FT TO THE RAMP NOR WERE THERE ANY LIGHTS MARKING THE EDGE OF THE RAMP. WHEN I HAD GONE TO WHERE I THOUGHT I WAS ON THE RAMP I TURNED ABOUT 30 DEGS TO THE R TO HEAD OVER TO FBO AVIATION AND RAN INTO THE BACK SIDE OF THE UNLIT RWY SIGN FOR RWY 27R- 9L KNOCKING IT OFF ITS MOUNTING POSTS. 1 PROP BLADE WAS BENT ABOUT 1 INCH BACK AT THE TIP AND THE FIBERGLASS NOSEWHEEL PAINT WAS DAMAGED. I CALLED THE TWR AND TOLD THEM I HAD RUN INTO THE SIGN. NO ONE WAS INJURED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: TWR SUPVR STATED THERE ARE NO TXWY LIGHTS ON THE N SIDE OF THE RWY 27R. THE TXWYS HAVE REFLECTORS EXCEPT FOR EXIT POINTS WHICH HAVE BLUE TXWY LIGHTS. ARPT MGMNT HAS AN IMPROVEMENT PLAN WHICH WILL ADD TXWY LIGHTS TO TXWYS.