I participated in the US Only Half Marathon. It was the first race I have ran/walked in that was more than a 5k. I learned that I enjoy the larger crowds (I believe there were about 1,400 registered) The t-shirts ran small and I didn't see that when I ordered mine. But overall the entire race was a great experience. It was a little rainy and cold on Bell Isle, but we do live in Michigan. Thanks for the great experience.