Make a giant floating island hovering above the pacific, filled with wonderful and otherworldly flora and fauna. It would have a completely 'alien' city in the middle of it, populated by pilgrims to my new utopia. There would be no crime, no disease, and all industry would go towards helping other nations (apart from what is necessary for the city to thrive). There would be no pollution, and it would be a shining beacon of humanity.
Also I'd build a giant arena under the sea, where I summon untold horrors to fight in epic battles with my unlimited power. I'd be like Goku with a lightsaber, heavy plate armour and Paladin light powers. Add some acrobatics-on-steroids, and broadcast to the planet. Free, harmless, and fucking amazing entertainment. Can you imagine how cool it would be if Jesus was all "I'm going to fight a hundred dragons with magic".
Sweet.