It happens to us all at one point in time or another and you loose your password. So here are two things to consider. You lost your password to your iPad and you still have the computer you sync with, most data will not be lost if restored. The other thing to consider is you don't have the password to a iPad, because you bought it used or are helping someone else get back into their iPad. If you don't know the password and don't have the computer the iPad was last synced with, you will completely restore the iPad no settings saved. I'll show you how to restore you iPad.
Before you do anything to your iPad see this video regarding iCloud: https://www.youtube.com/watch?v=OL8B2...