Yes, there is an explore Arcstone mission that has 5 steps. I have only completed 3/5 in my general ventures and the reward is "experience" so that may be enough experience to ding a full AA. You get the quest from one of the 2 guys standing around a fake corpse at the zone in from Freeport.
The horses are indifferent but you do not suffer any faction hits from killing them at least since I last killed them (prior to the patch). There is also a named horse, Master of the Herd, with the 3 mobs who follow him and he is indifferent, but I believe there are no faction hits for killing him either. So far, the horses are the only mobs that I've seen that are indifferent and I believe I have conned everything.
One final note is there is usually a good mix of see invis mobs no matter which camp you're in so be careful if you are trying to just explore around for the quest or just running around in general. The earth, wind & (of course) undead mobs all see normal invis if I remember correctly. Approximately 50% of the water mobs and 20% of the fire & spirit wolf mobs also see invis. This is all prior to the most recent patch so it may have changed (i.e. barely any wind mobs used to see invis when PoR was first released).
Edited, Sun Mar 19 18:12:09 2006 by Phistikuffs