Along the trestle there are a few areas for fishing as well as just kicking back and relaxing. It's a beautiful bridge that connects the Town and City of Menasha. The Town side is the side with the park and the Friendship trail continues with a map on either side of the bridge. The bridge is about 3/4 of a mile across if I remember correctly. If not, I'll update when I visit this park again.
The bridge itself is just fine for strollers and bikes. You often see people walking their dogs here too. Very friendly place to visit and chat with other people using the bridge.
Once I crossed over to the City side, I tried to follow the "path". You have to go through a few blocks of city before connecting back up to a trail. The city sidewalks are uneven and not well kept. As you get away from the map at the end of the bridge, unless you've written down where to go, you might not find where you're supposed to be. I didn't, but then I didn't have too much time or I might have. I'm not very familiar with Menasha so kept wondering had I gone to far or not far enough. The city on the other side of the bridge appears to be a low middle to low income area with homes that are not kept up very well also. It's not a scenic walk through the city but it is a safe area. Overall though, I'd give a try to going through the town on the path rather than on the uneven bumpy sidewalks of the city.