I've lost my iPad, and I want to destroy it

Unless you had Settings > iCloud > Find My iPad enabled on it then there isn't any way to try and locate it. If you did have it enabled then you could try locating it either via http://www.icloud.com on a computer or Find My iPhone app on another iOS device.

If you think that it was stolen then you should report it to the police. You should also change your iTunes account password, your email account passwords, and any passwords that you'd stored on websites/emails/notes etc., and contact your carrier.