if I were you, I'd lay down some cayenne pepper around your tomato plants. If you get some on the tomatoes, that's fine... just be sure to wash before you eat! You can also try dropping a few moth balls around the perimeter of your garden bed. This "should" help keep the critters away. Although, I did once have a chipmunk who wouldn't take a hint...no matter how much hot pepper I put down. Maybe he had sinus issues!
Happy Gardening!