I hated Ranging at low levels too, but it gets easier and more fun when you're higher. For now, I'd range the Dark Wizards south of Varrock. They're easy, and don't hit high, and drop lots of runes. From 50, you could try Fire Giants at Brimhaven Dungeon. It's usually uncrowded there, and there's a safespot for each of them if you can hit it right. Click the guide in my signature if you wanna learn more about "making" your own safespots.