Our OT recommended setting up two objects about 10 feet apart and having our daughter walk in figure eights around the two objects. This helps with balance and visual perception (crossing mid line). She also recommended having them track an object with only their eyes (no moving their head) that you hold in your hand. Our daughter has shown some improvement with these activities, but she can't walk the figure eight unless we direct her or put a string or something on the floor to get her to cross in the middle. She is inclined to walk in an oval without direction.
Another thing that's helping my daughter is a Hippity Hop. We just found one on Amazon for $10. It's not easy for her to hop with it without tipping over, but she still enjoys it and is getting better and better. Two weeks ago she learned to ride her bike without training wheels, so I know without a doubt the OT and home exercises are helping.
Writing her letters is still a struggle for her. They come out all different sizes, and she can't stay on a line, so if anyone has any ideas about helping her with that, I'd love to hear about it.