A rubber floor mat or carpeting cut to size and slit up the middle makes nice flaps. To keep cats off of tables, put strips of double faced tape on them. Cats will not like the feel of the sticky substance on their paws. Cats hates plastic so to keep your cat off your chairs, cover the chair with plastic until he learns it's off limits. A spray bottle of water will quickly train a cat not to do something.
Cats love to hide in empty boxes or paper sacks.
Attach a string to a ping pong ball and hang it on a chair or shelf to entertain your pet. Crumble aluminum foil into a ball for your cat to bat around. Garbage bag tswist ties and the plastic rings from the neck of plastic gallon milk containers are hours of entertainment for cats as well. When your cat refuses to take liquid medicine, spill the medicine on his fur. He will lick himself clean and take medicine at the same time.