Well actually, you do need an oven, but a Dutch oven will do. Your Dutch oven in this situation will heat up very quickly and unless you're vigilant, you could reduce your potential loaf to a cinder in no time. I had a great time baking outdoors, and I highly suggest you give it a try.
Heating up the Dutch oven
The dough about to be baked
New oven by the pond in the background.