We're staying a couple nights at the Big Sioux Recreation Area outside of Sioux Falls.
This medium-sized campground hugs the Big Sioux River, and it is extremely well kept. Sites come with power only (50A) and are huge - the perfect place to spend a couple of days.
I think Site E-28 across from us (shown below) might be the nicest of the bunch.
Today we're going to head to downtown Sioux Falls to take in what there is to see. Surely get some steps in and hopefully find some good local fare.