Ok, I use this a good bit, never get killed or reported for AFK, also, if you're not into botting/hacking like me, also tells you how to AFK without AutoIt. Sorry for not having pics. Don't think this is a repost, did searches.
Ok, in AB around BS there's the moat around it, so what I do is go under the bridge underwater and just sorta chill there. People will see you on the map as on the bridge, they'll think, 'Oh, he's guarding/watching BS'. Now if you arn't into AutoIt, just pop a Nagrand Cherry/Water Breathing Pot, then auto run at the bottom of the lake, you will move very slowly at the bottom of the lake, and if you get it right, your character's front half will go underground, move forward, then come back, move back, over and over again. Hope this helped you