Mr. Musicman,
The idea of Pyramid Winner's Circle categories is to test the ability of the player's logic, vocabulary, and common sense. "Lakes in Minnesota" falls under none of these categories; rather, it falls under "Arcane Trivia That No One (Outside of Minnesota Residents) Cares About." Thus, it is a very poor category choice.
(Too nice? Maybe...but after today's AFC championship game, I'm in a good mood. :-))
Getting back on track...how about:
THINGS THAT ARE ASSESSED
or
FAMOUS MUPPET FROGS...whoops, that one's for the special All-Star Pyramid featuring Sean Connery. :-D