North of Munising on the Upper Peninsula, the Grand Island National Recreation Area has miles of old forest roads and old carriage trails open to mountain biking. The most popular is the Grand Island Tour which is an 18 mile loop on the old carriage trail around the island perimeter.
To reach mountain biking at the Grand Island National Recreation Area, the Grand Island Ferry (906-387-4845) departs from Munising.
Grand Island stretches north for 8 miles, from its southpoint at Williams Landing in Munising Bay to the north end at North Point. Only three miles across at its widest point, Grand lsland offers 35 miles of shoreline, encompassing over 13,500 acres of dense woodland, including several lakes. Rapid-flowing streams cut through the rugged hills, and massive 300 foot wave-cut sandstone cliffs. Beaches of fine sand, winter ice caves and historic buildings and artifacts dating back as far as 2,000 BC are just a few of its highlights.
Camping opportunities range from random camping at undeveloped sites to primitive camping at designated sites along Murray Bay and Trout Bay. There are six designated camping sites on Grand Island; two at Murray Bay, and four at Trout Bay. At each site your tent must be within 15 feet of the camp site marker post.
FYI - there is no potable water on the island, but there are plenty of black bear.
Overall, Grand Island is the 8th most popular mountain bike trail of all 37 mountain biking rides in Michigan.