Heading out this weekend to Grand Rapids with the hubs, Oliver and Cristy to do a bit of mountain biking. I have heard that there are some kick ass trails out there, any suggestions??
Check out the Michigan Mountain Bike Assoc. (MMBA) trail guide: http://www.mmba.org/trail-guide You can input the zip code of where you are and it'll list the trails closest to that area along with description, directions, etc. It's a great tool for finding the trails nearest you. Ride safe!
Not sure how far you're looking to travel from Grand Rapids but some guys I work with love Yankee Springs over by Gun Lake or Middleville (can't remember which, maybe both).