Lisa, raised beds are much nicer to use than a flat plot. Your walkways are automatically made when you lay the beds, and you can reach across to do all your weeding, etc., without reaching too far or stepping in mud. If there's a sawmill nearby, you can sometimes get substandard cedar planks for next to nothing to make the beds with. You could also make a groovy cool pattern with the beds that is pleasing to the eye. 
I'd try to make the beds lawnmower-width apart, too. 
Karen
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insidious ungovernable cardboard