nice account...maybe go bossing or even get your agility to 99 even though you get bored just set yourself a target and accomplish it but do stuff inbetween to avoid the boredom.
If you get bored of runescape so easily take a break from it to see if you actually miss it. If you don't, then you've successfully quit runescape. Take up some other hobbies instead if you feel like you've got too much spare time.