THE PILOT/CERTIFIED HUNTING GUIDE, HAD 3 HRS SELF TAUGHT EXPERIENCE IN TUNDRA TIRE EQUIPPED PA18 AND 25 HOURS TOTAL SOLO TIME. THIS WAS HIS FIRST FLIGHT AS PILOT FOR BIG GAME SPOTTING. THE PILOT HAD NO PREVIOUS PREPARATION FOR HIGH TERRAIN FLYING. THE AIRCRAFT WAS FOUND VERTICALLY IMPAILED IN A SLOPING SNOWFIELD IN THE 5000 FT ELEVATION BOWL SURROUNDED BY 7000 FT TERRAIN. THE ACCIDENT FLIGHT WAS THE PILOT'S FOURTH FLIGHT IN THE PA-18, WITH 4.3 HOURS OF TOTAL SOLO TIME IN THE MAKE/MODEL.