Want to use those little emoji smiley face symbols to send friends messages or emails? You can modify your iPad keyboard to accomplish that. Make sure you are using the latest iOS.
NOTE for iOS 7, follow this link.
Go to Settings > General > Keyboard. Tap on Add New Keyboard.
You will be presented with a list. Tap on Emoji.
Now, open an app, any app that uses a keyboard. You will be presented with a reminder and a new icon will be next to the spacebar. It looks like a globe.
Tap on the globe and you will be presented with all kinds of symbols and choices. Tap on the various icons at the bottom to choose a set and scroll through the set from right to left to see how many pages of icons you have.
Tap an icon and tap the globe symbol to get back to the regular keyboard.
You can read more at the Apple support article.