Press that spacebar, jump in the water, fly around a mountain, or craft a bunch of stuff.
Double XP event today, but you can get more than you could ever before. You will get wrecking, macho and jumping skills, get those extra levels while you can.
If you want to know how to max out and get bonus points, maybe talk to Killjoy on how to be more efficient in some skills.
There are around 10 extra mcMMO skills you can get double xp on today, beyond the mining, shoveling, farming ones.