I smashed my kneecap falling down the stairs... (I had my hands in my pockets.... It sucked..) To this day, I still walk with a slight limp. It was a year ago! :(
Try experiments west of the Ectofunctus. You need to have done Creature of Fenkenstrain, but it's a great place, as the monsters have high hp and are low-leveled. Good luck!
Another great place is the experiment cave just west of Port Phantasmys (sp?). They have a lot more hp, and it's easier to pick up arrows. If you've done Creature of Fenkenstrain, you'll know what 'm talking about.
For free-players, i'd suggest the west varok mines (the one with the silver) or the Al-kharid mine. Varok is closer to bank, but Al-kharid has 3 rocks. Your choice.
I have 67 range, almost 68. I want to train it to 70, and am using iron throwing knives. Is this the best way to train? Yeah, I know that the cannon is the best, but i'm not willing to spend that much on cannonballs. Any other way to train?