[Highland Park] Help With Cat Behavior

Does anybody have any suggestions how to keep the cats off countertops, stove, dining table, etc.? I assume they search for food. They are in perfect shape and I don't want to overfeed them. They seem to be doing it more and more (since we were out of town for a while) and almost always at night or when they are not watched. With the baby on the way I just can't tolerate it anymore. They are healthy, active and loving cats, getting attention daily. Katarina