Hi !
Keep your campground clean. After meals, storage all food in the bear box. Your car must be food and food odor's free.
Use the camping trash cans.
Bears usually appears at dusk. I think I saw the same bear for 3 consecutive nights last year (end of July) at exactly the same time, between 8:30 and 9:00 pm at the family campground.
Normally people chase him making noise and the bear just escape to the woods.
You can check bear box size in this picture
http://1.bp.blogspot.com/-qm7bB5wN0lw/TkBrU-vXPfI/AAAAAAAACtY/e4vWXgWVLSg/s1600/IMG_0437.JPGEnjoy !