When your faction has control, go to where the main gate is. From there, find a good place to hide or use XYZ to get in a building. Start a anti-afk bot that makes you jump and your good to go.
Why there? When ever a faction blows open the door and caps Wintergrasp, everyone gets 500-3k honor. By simply standing there, you will get a generous amount of honor by simple afk'ing.