[Hectic]

There are lots but i guess it depejds on what you consider GTA.
There are three fields open to the public that are within an hour or so of toronto. Finch Field in rockwood (near guelph) game there on the 28th. Warsoft Nation in Ohsweken (near hamilton) Ill be there saturday. They run games most weeks check their website. And Flag Raiders paintball (lot of the hosts have games there more so in the off season) check the gamez and events schedual for ontario on theese boards. There are a handfull of private fields too but u will have to come out to some regular games and make a good name for yourself and make some aquaintences befor you get invited to those fields.