I have fished a few lakes around Minnesota’s metro area the past couple of weeks. Bass and Pike can be found in deeper waters; 8-12’ in and around weed lines. Sink tip or full sinking lines are highly recommended. Smaller flies are working better than big ones. Crawfish patterns and Woolly Buggers in attractor colors, size 8 have been the ticket. My buddy even landed a decent muskie using this technique. A couple of bass have been caught in the shallows near heavy cover, but this is not as effective as deep water.
Nice report! Looks like you guys are having fun! 
Looks like a blast!
Back several year ago a business associate took me fishing on Lake Mille Lac, in January. That looks like much more fun.
Must have been ice fishing! Did he have a fish shack?