Two Ideas for bunny games
You could do the Bunny Hop. Play the music and let the children hop around. They have a lot of fun doing this especially if you make bunny ears for them to wear and paint whiskers on their faces.
Also you could do potato sack races outside. The children pretend they are bunnies and hop to the finish line. One variation would be to hop to get a carrot and bring it back to your friend.