Updated for CB4, ArGL patch.
There is no easier jungler in the game. Fast clear, remains at high HP, and a kit to make every other initiator in every other moba jealous, Wonder Woman one of the world's best babies first jungler.
Items:
Marauder's Knife and Shield 1. The % damage passives don't stack, but the true damage on hit and the damage block do. They also resell for 225, so a grand total of a potions worth of loss when you resell them (and you will. Early). Beyond that, item build is inredibly basic, with little room for change. Rush Bible 2, then Olympus Gambit 2. Your ganks are mediocre, so pulling as much money out of the time you spend jungling waiting on team fights is important. Oly 4 is also an amazing late game item for her, so grabbing the credit generation early is most certainly worth it.
After Oly 2, normal tank build. Ruby 2, Necklace 2, Utility Belt 3 (4 if you need the cleanse). After these 3, upgrade Olympus Gambit to rank 4. The active effect is wonderful, and reduces tower/well damage.
6th item is situational. Lobos is great so you can cleave slows with your E, Mega Rod is great if you get really ahead or are against lots of squishies, every target your hit with E activates it, so if you hit 3+ people, you actually get a ton of damage per hit. Metallo's Heart (now that it works) is a stupidly strong item, especially if the enemy has multiple auto attack reliant characters (like Marksman, Nightmare Bat, Doomy, etc). Finally, if all you need is just pure AD, Spear of Destiny is never a bad pick up.
Jungle Path: Start at your elite with your other jungler, or get assistance/share XP with a laner to start at it. Top jungle is preferred, so you can safely farm your way into mid game. You clear exceptionally fast, so just keep farming until your team needs you. The camps get more valuable every time they respawn, so plow through them for 10 minutes and you'll have your core build, Crime Bible, Ruby, and Phantom Stranger's. Cap relays for your team, cover lanes when people need to heal, and prepare for the reason you pick WW, team fights.
Team fighting: Throw Q, hit Q, hit R, taunt whole enemy team. You are without a doubt the strongest team fight power in the game. After your ult, either help your team clean up with cleaved slow via Lobo's, or W a friendly carry and protect them from the diving enemies. Easy Easy Easy.