The weather wasn't really suitable (the overcast sky is too bright), and the time of day was wrong (it was midafternoon; Minnehaha Falls is a horseshoe opening due east), but it seemed like a good time to try doing some panoramas of the falls, so I did. Looks like it might be worth going back early (shudder) some sunny day.
Both of these were from 5 shots with an Epson 850Z digital camera, 35mm equivalent focal length, manual exposure, on a tripod.
The panoramas were produced using The Panorama Factory, a free program that I think is a first-rate piece of work.