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.
A big arena could be added at the tower and you could have an armor buff and you and a friend run through a arena with obstacles and shoot up your friends 1-a lot players. And If everybody was on there own team it could get crazy.