Today, I went for an interesting walk. I started near the library in downtown Wausau and walked north along what is called the "River Edge Parkway" along the Wisconsin River. It was green and enjoyable. There were historic markers along the way telling some of the history of the area. You can also go south from the same point along the river, passing the whitewater park, until you get to Fern Island. The whole thing is about three miles, I'd say. There are plans to develop it further on both sides of the river.
Other interesting walks I've been on here include a trail near the Rothschild Pavilion with a trail that goes out onto a little peninsula into Lake Wausau, a really nice new trail that goes from the Stoney Creek Inn up almost to the new pedestrian bridge across the river near Lignotech (Emily and I agree that this one is very bucolic and pastoral), and the Eau Claire River Trail in Weston, which is 1.25 miles and very well maintained.
Last summer, Janet and I also went to Stevens Point and walked through the Schmeeckle Reserve on the UW Stevens Point Campus. It was nice, too. You can see it here:
http://www.uwsp.edu/cnr/schmeeckle/ .
With the price of gas, I wish I could walk to the grocery store, library, etc!