Any of the parks will probably have a brochure on awareness in bear country.

Some bears know that ice chests are lunch boxes, so store them in your trunk, out of sight. If in the car, throw a blanket over it.

If you'll be in back country overnight, store your food away from your sleeping area. If there aren't food caches provided (bear proof containers), then sling a rope over a tree branch and winch your food up high out of reach. Toothpaste too.

I hear bear spray works, but to make sure it's reachable and not in a pack. Wear it on your belt.

In general brown bears aren't as dangerous as grizzlies. But don't get between a cub and it's mama. And if you must get up-close and personal photos of said cute bear, use a telephoto lense.