If you get off the thru-way on exit 60 - and take route 394 east that will take you into Mayville. It is about 8 miles off of the thru-way. Once you get into the city, there is a huge area along the lake where you can park and ride. They sell maps at most of the area bars. There are also a few hotels right in that area in case you wanted to do an overnight thing.
Let me know if you need any more info.