When I blogged on all 108 St. Louis parks, my visit of Kiener Plaza took place in May, 2014. This was the 1980's version of the park that was dedicated in 1962 complete with Reagan-era amphitheater. This version of the park was dead nearly year round aside from some really hot days when families came there to cool off in the fountain, or when there was a programmed rally or event. But make no mistake, this was yet another dead zone in Downtown St. Louis. You can read all about that 2014 visit and see "before" photos, including some historic info on the popular runner fountain HERE.
Kiener Plaza just went through a massive ~$23M redo and was re-opened to the public in May 19, 2017.