On runescape what should I fight to get good exp?

I am working on my attack it is at level 67. My strength is level 66 and my defence is level 60. I would like to know what I should ight to get the most attack exp. Im trying to get to level 70 for the whip. I use a D Longsword, Granite Platebody, D Helmet (not full), Dragon plateskirt, and dragon boots. IS there different items I should have? If so what should they be and definately what should I be fighting to get the most exp that will work for me?