Im fairly confident that enchanting diamond jewellery would be quicker than smelting iron(67vs53 xp per), and swordfishes are faster for cooking- though, who cares? if we have all skills 99 we wouldnt want to be f2p anyway. The first post is wrong about fletching- 1.4m xp can be gained making dragon darts, not arrows. I don't think you can enchant diamond jewelry (or any jewelry) on f2p. I might be wrong though.