Q: How to turn off iCloud

Save any photo stream photos you want to keep to your camera roll by opening the photo stream album, tap Edit, tap all the photos, tap Share, tap Save to Camera Roll.  Email any notes you are syncing with iCloud to yourself if you want to keep them.  Finally, if you are syncing any iWork documents with iCloud, turn off iCloud syncing in your iWork app settings.

When you're done, go to Settings>iCloud, tap Delete Account, and when prompted choose Keep on My iPad.