Tahquamenon Falls State Park
http://www.michigandnr.com/parksandtrails/ParksandTrailsInfo.asp?id=428
and Whitefish point are two definites.  Mackinac island is an
interesting place to visit as well.

I'd try to camp at the state park near Tahquamenon falls.  It is
beautiful with lots of old growth and the trails take you
through forests full of green giants.  My first real camping
trip in the Camel, that was 4 years ago, took me from AL to
Detroit and up to UP in two days.  I actually went for a swim in
lake Michigan, but would not dare to dip into lake Superior near
Whitefish Point.  Sault Ste. Marie is good to visit with the
docks and ship museums.

Good luck and take lots of pictures!

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Chris S.'85 Westy Camel -> http://www.knology.net/~vw/vws/camel/ '84 Westy Hershey -> http://www.knology.net/~vwghost/hershey/ '01 NB TDI -> http://www.knology.net/~vw/Beetle.jpg