I did a quick search. didnt find anything.. so if I missed an old post. plz dont flame. here is a detailed guide of most of the areas in cenarion refuge where u can kill a player w/o gaurd agro.
[img=http://img2.freeimagehosting.net/uploads/th.c874b4dc46.jpg]
Yellow Line: Where the tree gaurd pats
#1: standing on the rail. be careful tho, a guard pats in and out of that building. wait until he's about where the yellow line starts on the pic before you attack. You should be able to reach (with almost any spell) to where the bridge begins. A lot of players seem to go afk there (on my server at least)
#2: Standing in the water between the 2 huts. you can reach any player looking at the quartermaster. (more afkers)
#3: my favorite, inside the inn against the wall in the corner. wait until the gaurd that pats in and out to leave.
#4: Outside the town. Kill afkers on the Inn bridge or by the stable master.
#5: Kill afkers on the bridge or in the moonwell.
I'm sure theres more, so have fun.