THE PILOT AND A PASSENGER WERE COMPLETING A PERSONAL CROSS-COUNTRY FLIGHT FOR THE PURPOSE OF HUNTING AND THE PILOT PLANNED A LANDING IN A REMOTE AREA OF TUNDRA IN AN AIRPLANE EQUIPPED WITH LARGE TUNDRA TIRES. THE PILOT ESTIMATED THE LANDING AREA TO BE ABOUT 600 FEET LONG. THE PILOT LANDED IN ABOUT THE MIDDLE OF THE AREA; HOWEVER, THEN DECIDED TO PERFORM A GO-AROUND. THE PILOT ADDED FULL POWER; HOWEVER, THE LEFT WING AND LEFT LANDING GEAR STRUCK ABOUT A 20 FOOT HIGH TREE. AFTER IMPACT, THE PILOT LANDED AND DISCOVERED THAT THE INTENDED LANDING AREA WAS 400 FEET LONG.