A cheap am/fm radio quietly playing a talk show works pretty good. I think Rabbits and deer hate Howard Stern the most.
You also can get a cheap motion detector light fixture and take out the bulbs and put an adapter that screws in a light socket and makes a 110 outlet of it then with two extension cords one to the fixture, which can be moved anywhere in the garden, and one running out of it to a noise maker, lights, something that moves, or all the above, you can run them off. I caught some neighbor kids smoking in my tool shed like this--the other cord turned on a lamp in my computer room.
Of course you can shoot them with a bow or pellet rifle too, I'm not too concerned for the rabbits' health, but you may need to stay up all night to get a shot. I've also caught some in snares, but there always seems to be some more that didn't get caught.
