I live in W. Colorado and have bears almost every day in my yard. Sometimes they even bed down in my grass. Keep in mind that Colorado has only black bears, which tend to not be aggressive. Just the other night I scared one off by simply growling at it, and it was a big guy only about 20 feet away (I was next to my door just in case). Keep your food in your car trunk or bear boxes if the campground has them, don't cook in your camper, and you shouldn't have any problems at all. If you really want to be super prepared, go buy a can of bear spray (Amazon has it). Your car's panic button will usually scare them away. Most black bears are not aggressive.