One of the few drawback of the ukulele is its lack of volume. There are a few options to overcome this. You could use a standard microphone, or you could use a transducer pickup (which you stick to the outside of you ukulele and it picks up the vibrations). But the most fun option is to buy an electric ukulele.
Some electric ukuleles (such as the Applause ukulele) are hollow bodied ukuleles. Some (such as Fluke ukuleles) are standard acoustic models. But the most entertaining are solid bodied ukuleles such as the BugsGear EleUke. These are not restricted in their shape, so come in all sorts of strange designs.