3-4 weeks next summer: where to go?

I’m looking for suggestions for a three to four week paddle next summer. I live in New England and would prefer to keep my driving time to four days or less one way.

With driving distance as the only qualifier I can think of hundreds of possible trips in Labrador, Quebec and Ontario!

Mostly lakes?
Mostly rivers?
A mix of both?
Portaging - none, some, lots?
Rapids - none, some. lots?
Scenic values?
Cost/difficulty of access/egress?