PvP would have been my answer 5 years ago, strikes are probably #2 right now but what I really want is patrol! Maybe it's me getting older but just walking (sparrowing?) Around to see the world is what I want most especially in a beautiful handcrafted world. Public events seem to be the coolest part about the game and doing little sidequests and jumping into 9-15 PvE brawls where you can be as up close or sniper on the ridge like as you want :)