There's a small aviation museum across the river in Illinois that I once visited. The gentleman there told me that on any nice Saturday you can find many experimental aircraft flying at the Creve Coeur Airport. I've never had the opportunity to visit there as yet. Might be worth a look.
Michael, you might contact Greg Gremminger, the US distributor for Magni. His website says his training is based at Perry, MO. That might be a longer drive from St. Louis than you'd want to make every time you fly, but he may know of other options in the area.
It looks like the Creve Coeur Airport is pretty close to where I live; I'll have to check them out once I'm over there.
Perry looks pretty far, but I'll probably drive up there to see it sometime if I get a chance.
Welcome to Saint Louis. Creve Couer airport has several types of aircraft; from Waco biplanes, taildragger Cessna's, turbine powered experimentals, to an Avenger with folding wings. Unfortunately, I do not know of any gyroplanes at the airport. Saint Charles county airport has two Magnis, and a highly modified Bee in the hangers. The Magnis fly often, and the bee is getting a larger engine I think. Gregg is in Perryville MO which is about 1 1/2 hours from downtown Saint Louis, and is the Magni dealer for this area. To answer your original question, Saint Charles County airport is probably the airport that is most familiar with gyros.