Whenever I get bored, I usually go on SinglePlayer world and do /xp 5000 xI_LIKE_A_PIGx and I keep doing that until I reach level 1000, but i am currently at around 800. I also am currently sotcking up Gobstone308's and I's shop for our grand opening event sometime next week!
When I get bored, I get some mods for single player like gun mods and city mods and then the mocreeps mod on top of that and then battle it out with monsters in a city with guns. I prefer the ICBM mod for single player so you can nuke your city if all else fails. What I do on emc to keep me from boredom: go on utopia travel out super far and make a artifact like I build something using moss stones and say to myself " someone is bound to find this one day"
I really like this. travel throughout the entire wild on a server, placing random landmarks; in hopes that someone will find them one day...