When I run my sleds, I mainly have taken them down to my boss's place off Tichigan, and run the Fox up towards the north. Its probably my favorite place to ride; high speed, wide open and its length gives you plenty of miles to ride.
Is there a site that lists what rivers are safe to run, or or how to locate more places to ride? I tend not to ride trails, as many I've been on (largely the ones up by kettle morain) are extremely narrow and lower speed.