Here is a link to all of the various TART trails around the Traverse Bay area T.A.R.T. and I found my friends blog when he toured the perimeter of the State. Day 14 and 15 have the information about Traverse and the Leelenau Peninsula and can be found here.

Earlier you mentioned some must do's or nightlife. There are plenty of venues. There is a tall ship, the Manitou that does evening dinner and sunset cruises, or at least they used to. It's a beautiful sail on the Grand Traverse Bay. If you google tall ships and Traverse City I'm sure something will come up.

I just returned from a trip to the upper peninsula and did a recognizance car ride to scope out a planned trip from Charlevoix to Mackinaw City. It's gonna be awesome!

Enjoy your stay and your bike ride with your sister, post photos and a ride report when you return!