The "High Lakes" in the Eagle Cap Wilderness are full of small Brook trout.  Plan on eating them - nothing better.  Take a selection of flies, including some small sz 16/18 dries and nymphs.  Some lakes have so many fish that a wide variety of larger flies will also work.

7/13/17:  Many lakes are now ice free, but check with USFS for latest reports.  Aneroid Lake produced 54 trout (but, hey, who's counting) on flies for one young man - one day last week.