sorry for long delay in response....
lady didn't cite any regulations to me; it was either that or leave it in my car that. she just said that it was rules of state parks and that "imagine if everyday people say you open carry a gun, they would freak out, it not everyday u see people with guns who aren't the police." i was confused on what difference my gun carried in the open, was unloaded or loaded?
i CC carried anyway, but it got hot and i OC for a bit, nobody was around (found nice quite slightly hidden fishing spot) i was never approached by anyone DNR or otherwise during my day trip at 7 lakes state park.... again i talked with a lady at the state office in law enforcement division about this matter. when i do CC out fishing i carry a blackhawk serpa holster, so CC that is difficult but i do mange to meet "state requirements for concealment"
i have OC a lot more lately and have yet to be harassed by any local or above PD... there are still few places i don't OC tho for personal choices, grand blanc township and city mostly. when i am approached by most people they ask if i am a police officer, i reply no i am not. and tell them about some OC laws that i know and refer them to MIopencarry.org for more information.