There are wonderful hiking/snowshoe/biking trails near the Lester ski trails, but they're not lighted. A headlamp can be fun, though.

Drive past the ski trail trailhead and park where there's a barrier across Seven Bridges Road. You'll see the hiking trails, which wind through the hills around the river and offer some nice views. You can also snowshoe up the river itself, which is a lot of fun. 

Normally it's pretty obvious which trails are hiking trails and which are ski trails; the ski trails are groomed. This year, people got used to hiking on the ski trails because they were unskiable. Now that there's snow and the city has started to groom, hikers have made it hard to see where the groomed trail is because they've tromped it full of footprints. I think most of them don't realize they're on ski trails, because the trails are not as well-marked as they could be. I wish there were signs explaining that even one person punching footprints into the trail damages the skiing and destroys a lot of expensive work. 

But, basically, if the trail at Lester is wide, it's a ski trail. If it's narrow, it's a walking trail. If it's somewhere in between, it's a snowmobile trail. It's legal to walk on snowmobile trails; whether it's worth the risk is up to you. It's not legal to walk on the ski trails, and you need to buy a ski pass to ski on them. 

Here's a map, but it's kind of hard to read unless you already know what you're looking at.