You can:
* Take a receipt of proof of purchase to apple and have them remove it for you.
* If you don't have this, give them a call and then provide them with enough proof of identity that they can at least TRY and match this ipad to you
* Try and restore the password from a backup using forensic tools. This software costs alot of money, but there are people out there who can help.
If you are unable to do the above, you have a very lovely paperweight.