There is a group that does ride a few "local" places. I cannot remember what they are called but I ran into them once up at Mid Michigan Community College. I think either Rays, or B-Xtreme in Midland may have more information about group rides. Myself, I'm in Bay City, & I usually rotate between Mid Michigan, Ithaca Jailhouse, Gladwin County Park, Ogemaw Hills Pathway & Rifle River Rec Area. I try to hit one of these places weekly as each is about an hour drive from my house. Send me a PM if you want to try to get together & ride.
09 Specialized Epic Expert Carbon
14 Specialized Crave SL
14 Salsa Beargrease