Back a bunch of years ago Ontario came up with their "living legacy" land use strategy.
From that they eventually came out with Enhanced Management Area's.
Basically what it is, is that they came up with a "master plan" for each area - how much to protect, what type of use is allowed etc - so in "non-EMA's" just about anything goes including mining, tree cutting, hunting, fishing, hiking etc etc.
Other areas (EMA's) will have limitations on what can be done there - so maybe no logging or mining but you can hunt, fish, camp and hike. Others don't allow any motorized vehicles to limit access (retain as a "wilderness area"), others will be game preserves - so no hunting, but you can log (selectively).
It sounded like a great idea in the beginning so we didn't end up with all the forests moved down or full of strip mines, but like everything ultimately controlled by politicians, most don't even understand why things were done in the first place, and corporate money talks - so while there are areas that were supposed to be "natural heritage", you can't hunt, but they "now" allow logging or mining, because getting re-elected by promising jobs is more important than saving an area for wildlife....
We fish up north of Chapleau in Missinaibi provincial park which is inside the Chapleau Crown Game Preserve - the park itself is the river all the way to James Bay. You CAN hunt in a good deal of the park as long as you are north of a certain line (train tracks just north of the Preserve in this example) - there is no hunting or trapping in the portion inside of the preserve (although there are some grandfathered trapping licences).
So you just need to identify the area and then either contact the MNRF or go searching for the designation to see what is permitted. Essentially though - unless it's a preserve or provincial park, hunting is almost always allowed (at least once you get away from Southern Ontario) - and hunting IS allowed in a number of Provincial Parks - it's just really tough to find someone who can give you details. Ask any of the park staff and you get the standard "hunting isn't allowed", but the info is contained in the EMA designations.
(edit)
Here is some of the wording for one area (a park in Northern Ontario was expanded to adjoining lands):
Commercial forest operations are not permitted within the park (OMNR 1992).
The harvest of non-timber forest products such as club moss, Canada yew, etc., will not be permitted within the park (OMNR 1992).
Existing authorized wild rice harvesting may continue. New operations will not be permitted.
There are no fuel wood cutting permits currently issued for the park. New permits will not be issued (OMNR 2000).
Sport hunting is permitted to continue. Considerations of safety and conservation with respect to hunting may be made through future management planning, which includes public and Aboriginal consultation (OMNR 2000).
The Fish and Wildlife Conservation Act (1997) and the Migratory Birds Convention Act (1994)govern hunting within the park. The Ontario Hunting Regulations Summary contains regulations specific to this area.
The harvest of bullfrogs or snapping turtles is illegal in provincial parks.