I would focus mainly of ghosts and merits. I would also look for trollers and flamers. Warn them. Or ban them, depending on the severity. I would be very responsible, and clean up game spam.
I'd lock threads. The game comments are a lost cause.
Also, I'd learn all the secret tools the mods use to move and delete and lock crap, ban people (>) stuff like that. I wouldn't do anything bad. OF course, when I'm done, I'd ban myself for the minimum time possible for fun XD
I would ban all the people who once tried to flame me. Then, I would ban all the mods and admins. After that, I would change all the thread titles to phrases such as "**** YO ALL" and "CHEEZE PUFFZ!"
After I changed the titles to all the threads, I would ban all the users I possibly could. I would hack into everyone's account and change their passwords and write crude messages on their abouts and make them look like pigs.
I would merit every single random one word comment I could find and delete all the merit worthy comments in games. Then, I would rule Hyru*cough* ArmorGames!