Yes any legal adult can Open Carry, as long as your not a prohibited person and at least 18.
Here is a good start to the legal stuff http://www.wisconsincarry.org/default.html# Then click on Legal in upper right then WI Legal Citations.
Most malls are off limits by a tiny little rules sign posted somewhere
Link to download Wisconsin Open Carry pamphlet:
Most importantly, Don't talk to Cops, anything you say can and will be used against you in a court of law.
No vehicle carry
No State Park
No Govt buildings
No Bar\Restaurant with Class B (on premises consumption) unless you have permission from Owner, manager, License holder
No school zones (knowingly in school zone)