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Dump unnecessary apps
Tap on Settings > Apps and swipe to the left to get to Running.
There you'll see a list of apps that are currently running and you can tap on each one to see what they're doing, and you can stop any apps that you don't need running in the background all of the time.
Bin unnecessary widgets and wallpapers
There's no such thing as something for nothing, so get rid of anything you're not using or don't find useful.
Clock on Apps and swipe left to go to Widgets to see what's installed.
Live wallpapers are a far bigger drain on your device's battery than static wallpapers, so if you want the most out of your battery, don't use them.
Tap Settings > Display > Wallpaper to check or change your settings.
Sleep the screen
Since we've already ascertained that the screen is one of the biggest drains on a device, it makes sense to not have it on when you're not using the device. Set it to go to sleep after a short interval.
To do this tap Settings > Display > Sleep to change the interval. I keep it around 15 to 30 seconds.