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I second renting a tractor with is brush hog.

Renting a skidsteer may serve as well if its just the roads you are working to clear and there is nothing more than saplings in the way. You state you got there with a machete so this could work. This will allow you to get closer to the ground and possibly fix high or low spots. However, it will also just push things into a pile rather than cutting/shredding like a brush hog.

DR makes what I believe they call a "Field and Brush Mower" essentially a walk behind brush hog (others make them as well I am sure). I have heard they work ok on small clearing. Though admit to not having any first hand experience.