Most direct route would be going out the front of epcot and taking the bus. If you take the monorail, you'll have to transfer to another mode of transportation to get back to fort wilderness.
If you want to get a cab, you would have to walk out the WS exit and then walk to the beach club and through the resort to get to the parking lot where you could get a cab. Just doesn't sound like you'll be saving yourself much walking to try to get a cab.
Maybe ask on the transportation board for an idea of what it would cost.