To me the biggest thing is getting the hide off ASAP, and I usually pull/trim the bigger chunks of fat off. Hang in a game bag, letting air circulate on as much surface area as possible (don't overfill bags). Hang in shade when possible while you work on the rest. Not always available within a reasonable distance, but a shaded draw with water is usually much cooler than temps mid slope and higher. Meat care for bear is essentially the same as other animals, but with their fat content they seem to spoil quicker.