If you ever want to delete your iCloud account, you can actually do it straight from your iPad.
Go to Settings -> iCloud, and at the bottom, you should see a big “Delete Account” bar. Press it if you please; before your account is deleted, you’ll get one last warning before it’s gone for good.
Note: When your iCloud account is deleted, all iCloud data on your iPad will be cleared. The data still remains on iCloud and can be put on your iPad again simply by adding your iCloud account.
Have fun with your iPad!