Jasper and Mark Gilbreath Field... the fact they named it after Mark is spectacular, but it sits next to the train tracks, and I did witness an official time out and clock stoppage that occurred due to the unending train whistle. My late Dad worked with some of the engineers that went through there, and they would claim they hoped to cause a interruption if they could. It kind of gives a Brewster's Million feel, without the million of course.
Cass Midway if I recalled had a field and school that seemed in the middle of nowhere, yet had a herd of cattle grazing right next to it... kind of ironic when you realize you're literally on the outskirts of the KC urban sprawl.
Rich Hill, with the old high school building and rock bleachers, could give you the feel of a an old prison yard. You didn't dare drink the water or shower there either.
Now, for some fields I think that would be fun to watch a game at would include Odessa Permian at Ratliff Field (not really small school though), and I'd like to see one up in Barrow, Alaska, on the blue field next to the Arctic. Not sure if I'll ever make it to those. Of course, just to pull up and watch some 6-man game at a spot in the road in Texas or Kansas might be cool as well; one would think the concession and food might be decent at some of those.