First welcome to DRN. As far as Off-Road clubs, I don't know of any clubs specifically for off-road/trail riders in Manitoba. The Manitoba Motocross association is a very large club but as the name implies it's for MX racers. There is some very nice trails in the Libau area as well as Seddon's Corner, Marchand, Sandilands, Carberry and Fort Hughes area's. I'm sure there is also considerably more awesome trail areas in this province that I've never had a chance to check out.