Magic island indeed! Been up there 8 time so far; my next trip is schedule in about 3 weeks.
The Minong is the toughest trail on the island, with lots of ups/downs/rocks. That said, the views are tremendous. Of the campsites, Little Todd & Todd Harbor are my favorite on the north shore, while I find North Lake Desor my least favorite on the Minong. East Chickenbone seems among the least desireable camp grounds.
McCargo is a good place to include, and definitely explore the mine shafts near there. A great place on the web for specific route questions is at isleroyaleforums.com.
Enjoy the trip!