The Dells are, in a way, the Midwestern version of Niagara Falls: somewhere so overrun with tourist kitsch and unpleasant marketing types running the tourist traps, that one is almost embarassed to admit that the area, itself, is very nice to look at, once one leaves some of the unpleasantness behind.
I went looking for images of Witches' Gulch that people had uploaded. This is one I found. I'll do some more looking later.