Open carry is allowed in Florida if you are en-route to or on a camping, fishing, or hunting expedition. OCNF is the same as elsewhere in Florida.
Link to Statute
Under Lawful uses; although I don't specifically see it saying open carry, that has been accepted practice as far as I know the statute states it is legal to possess for these activities, and it is illegal to conceal without a permit, so the only other option is open carry. So roll up a hand line and some hooks in your gear, or a collapsable fishing rod. There's always a fishing hole in hiking distance.
(h) A person engaged in fishing, camping, or lawful hunting or going to or returning from a fishing, camping, or lawful hunting expedition;
It is legal to carry concealed with a permit, on any Florida Wildlife Management Area, and most of Ocala National Forest is one.
Personally, I prefer concealed, it doesn't disturb the hippies, or the cops, and JI like bad guys to be surprised.
Mo info