Umm... vibrant may be a little too optimistic a word. They keep them nice and all, but there aren't a ton of options, especially for longer trips. The Ice Age Trail seems to be coming together very nicely though.
Yeah I started to say 'exists' but that sounded like I was insulting the state too much. One question -- an early trip I'm planning is a drive up Lake Michigan, along the UP and over to Mackinac. Ever done it? Is it easy to drive within a stone's throw of the lake so I can look at it while I head north?
Once you get north of the Wisconsin/Michigan border at Menominee/Marinette, highway 35 has nice views of the lake while you drive. I haven't taken highway 2 past Manistique, but there are some nice views in places up to there. If you're exploring, you might take 183 down into Garden, MI. I was there once a few years ago, and it's very rural, very off the beaten path. That peninsula is nice and has some nice views of the bay.