Arcticrat,
The link below will take you to the St. Paul Park and Rec website. I was doing some quick searching and didnt find anything specific for circuit training, but there is some contact information available. I can make the call for you and message you tomorrow. I am also curious, as I visit the Twin Cities on a regular basis.
http://www.stpaul.gov/index.aspx?NID=243
The Minneapolis Park and Rec site is here. Thought I would add that since its so close.
http://www.minneapolisparks.org/home.asp
Weekend Warrior's advice is probably your best bet, but thought these resources may help.
I will be traveling to Norway this August. Extremely excited to visit your country!
Milon