You could visit the art museum. The Library Center usually has stuff going on. Catch a movie. See Avatar - that's almost four whole hours indoors with some tasty popcorn.

Or, do one of my favorite things and play Mall Walker Bingo. Make a little bingo card and fill it with things like: Lady Who Has Way Too Many Kids, Old Lady Mall Walking Group, Dude Holding His Wife's Purse, Clandestine Job Interview, Couple Holding Hands, Awkward Dad at Hot Topic, Embarrassed Guy at Victoria's Secret, Drug User Nodding Off. It's fun!