If you want to go North in summer try this
http://www.mackinacisland.org/
I saw an old travel log on Turner Classic Movies about this place and I looked it up because it was so cool and I think it hasn't changed in many years.
The Grand Hotel has the longest veranda in the world. Take a look. I haven't been there yet but boy do I want to go.
Where ever you go, have a great time.
peace