Well, actually, there is a lot to do in Michigan - unfortunately your driving route doesn't take you anywhere near any of it!
I graduated from Western and, yes, there is a Greek store there.
However, there is no Kappa chapter at WMU so they won't have anything for you. Your better bet for that is the one in Lansing. But, if you want to check out the houses, they are on Fraternity Village Drive, which is off of West Michigan Ave.