blvette,
Miles of trails is hard to define. You can ride the North Shore state trail out of Silver Bay up to Grand marais, think it's about 80-90 miles that way, then if you wanted to once you were up in GM you could run the gunflint trail another 60 miles to the end of the Gunflint, and come back down on the expressway trail, then you could ride the trails along the shore back to Tofte and then cut up to the Trestle inn and run the Tomahawk to Ely. See what I mean, there's hundreds miles of trails to ride. That doesn't even count all the off trail riding and forest roads and small local trails. There's way more trails than you could hit in a weekend.