I've done some biking around the edges of the Maine coast, and V and tygab are right - it's beautiful. My rides have been both touring and day trips. Maybe some of my journals can give you some ideas for rides or trips of your own:

http://www.crazyguyonabike.com/doc/denise2006downeast - June 2006, day trips, Acadia, Machias, Freeport (+ a visit to the puffins sans bike)

http://www.crazyguyonabike.com/doc/denise2005downeast - June 2005, same area as June 2006 trip, mixture of touring and day trips

http://www.crazyguyonabike.com/doc/Denise2002Maine - day trips in south coastal Maine, photos & descriptions, ride from the explore Maine web site that V mentioned above.

I don't think you can go wrong riding in Maine! Hope that your friend likes it and that you get a chance to visit her - with your bike, of course.

--- Denise