The ski area operator is subject to the highest degree of care with respect to the operation of ski lifts, as well as general negligence principles. But there is no claim against a ski area for the inherent risks of skiing, including changing weather conditions, variations or steepness in terrain, snow or ice conditions, surface or subsurface conditions, bare spots, creeks and gullies, forest growth, rocks, stumps, lift towers and other structures and their components, collisions with other skiers and a skier’s failure to ski within the skier’s own ability.