For friends that need to measure manliness a dueling area would be sweet. Maybe use the iron banner area for challenging ppl to duels as an interact option. Just make lord saladin appear or vanish as nessicary. Just a thought.
I was literally talking about this to my friend about an hour ago. I was thinking something like Borderlands would be cool, having a battle in the over world, maybe placing some bets would be cool :p But a bar fight on the Tower sounds amazing as well xD