Up here the populations are real cyclic on around a 10-year span. Is yours the same?
We are just swinging up out of a low. A couple of years ago I'd have to hunt 2 or 3 hours to see one, and it was up to me whether I got it or not. This year I average 2 or 3 per hour hanging on my belt, and usually see more I don't get shots at.
Next year will be even better, but I don't anticipate the peak till at least 2013. Last peak I was shooting 6 or 7 an hour. Head shots only with a handgun. And that was after missing several on top of all the ones I didn't even get a shot at.
Only reason I'm telling you all that is background for this: In low years, there are still hot spots. You'll go a long ways finding no rabbits, then come on an area with enough to encourage you. The big difference from years like this one, there doesn't seem to be any "depth" to the hot spots. You can go there and take rabbits about twice, but it won't be a hot spot on the third trip. In up years, it's likely to stay a hot spot no matter how many times you go back.
Long and short of it, I'm betting (or is it hoping?) you're in a down year and haven't found the right spot yet. More hunting required!