Runescape can be hard at times, but never resort to cheating. Cheaters never win, remember that. The only thing cheaters get is a nice ban. Alternatively, maybe not so nice, Haha. Runescape bans accounts for cheating daily. If you find a cheating website then I would suggest sending the link to Jagex. If we can get rid of the cheating, then Runescape Powerleveling will be a much better place where hard work is rewarding. Jagex cannot do it on their own; they need the help and support of their players.
Goblins are excellent for low and high levels. They are easy to kill and give a nice amount of exp. Remember; you want quick and easy kills that give fair experience points, instead of slower kills and more experience. The reason is, with fast kills you can double and triple the experience in the time it takes to kill the higher level. Goblins are perfect for this. They are dead in about two to three hits and then you can be on to the next one.
The Stronghold of Security can be very fun, especially if you have not done it before. At the end of each level, there are rewards. For just the first level, you get 3,000 gold! The prizes just go up from there. If you are power leveling, no matter where, you are most likely going to need food. I highly recommend Tuna. They do not cost too much cooked and they heal about 10 points each. Carry around some Tuna, and it might save your life.