I've been amazed at what just plain discing can do. Run the area back and forth multiple times, let it rain a few times, do it again from a different angle. It will not be rough when you're done, but it might have some gentle undulations. I guess it all depends on what implements you have on hand, and how perfect a grade you want. Even with a couple of bigger swells in the area, discing, then doing a little spreading with a hand rake might be enough, if a disc is all you have.
Some of the guys with experience with a land plane tell me that that one is the perfect tool for this job, but many people--including me--don't own one. Many possible solutions.