Personally, I'd take rideshare to the Swan. Drop off at the front entrance, straight walk through the lobby to the causeway toward Dolphin, take a right and cross the bridge to the Boardwalk, and walk from there to Epcot IG. Or walk a little farther along the causeway to the Friendship Boat dock and catch the boat to the IG. The boat will stop at Yacht & Beach first, then BW, before getting to the IG, so it will take longer than walking but will save your feet, if that's an issue for you.