there actually is no best attack xp quest for runescape but you could try some members ones
You have to complete the quest "Wanted!"
u have to do hero's quest
find something easy to kill with a lot of hp.
Just click on ''put the banana in the rum bottle in the crate on pirates teasure quest on rune scape" really easy
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Check the link below for a guide on how to complete the quest.
If you want to know how to finish a certain quest try visiting these sites.(www.runehq.com or www.zybez.com)
If you ever need help with Rune Scape go to Sals Realm Of Runescape. I have used it to beat many hard quests. I am a lvl 79.
Runescape
Catherby.
south east of varock were all the witches are
You need to be a member to get any of the skill capes