Nutty bars. Not to spoil your fun. You would have seen it anyway.
Three Sons in Milford probably still has a huge selection of 1/2 off clothing and sportswear (even post-Internet) an is probably worth a stop, maybe on your way there or back. It used to be the entire second floor.
It is also home of the University of Okoboji, which you can find a lot about online. There is a Wall Street Journal article from the 1970s. A more recent local article had a photo of the smiling Richter brothers up front, and a sign there that unattended children will be given an espresso and a free puppy. :0
IIRC.