We live in what is possibly one of the best disc golf areas in the country - a few years back my brother saw a thread on a disc golf forum that put the highest hole density as somewhere along North Territorial in the Dexter type area.
Hudson Mills has your epic 48 holes.
Kensington is fun (can be crowded).
Decent course by my house (Cass Benton), if you can beat the swarm of stoners.
I played something like 100 unique holes on my birthday one year.
Stony Creek was also good, but a hike so we never played it much.
My long term plans were to start biking to Bandemer, playing a round or two, and then biking home - would have been a great workout from the old place.
It may help that one of the disc mfgs is just in Wixom (http://www.discraft.com/contact.html
My playing really took a dive when my usual partner followed his wife to her law school in Bloomington, IN, and subsequently LA. In fair weather we sometimes squeeze in a round when he has to come back to U of M (IT support for medical something) for work.