Oh, wow. I didn’t realize that. Is your computer a Mac?
Do you have a ton of apps, photos and personal info on there? If not, you could just disable all that in the iCloud Setting panel and sign out of the iTunes and App Store – after following the backup steps below.
Plug it in to your iTunes. On the grey bar in the left of the screen, the iPad will appear about halfway down. Hold Control + click the iPad (or right click on Windows) and a menu will appear.
First choice will be “Transfer Purchases” – this will copy any new App purchases and updates you’ve done on the iPad since your last backup. This may take a while if you don’t know when you’ve last backed up. If you get a popup that there is an iOS software update available – decline. You want to be sure to back everything up first (I’m pretty sure the software would take you through that process, but just in case, let’s do it manually).
While this is running, you will see progress in the display at the top center of iTunes. On the screen below is your iPad summary that will tell you when your last backup was, and what backup settings you’ve chosen.
When the transfer of purchases is done, click the Back Up Now button – it’s just right of the middle of the screen.
Now would be the time to run the iOS update which would be found in the top box above the Backups box – but it might take a while, so it’s OK to skip it if you don’t have the time.
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I made an error in my first response – DO NOT DELETE YOUR iCloud ACCOUNT – make sure you have Find My iPad installed and activated – just deactivate Mail, Contacts, Calendars, Reminders, Safari, Notes, Keychain, Photos, or Documents & Data in the iCloud settings. Also disable iCloud backup in the iCloud > Storage & Backup tab.
Additionally, you can go to General > Restrictions > select Enable Restrictions and choose which functions to allow (green) and which to restrict (white), such as anything that would involve purchases if your friend doesn’t have an Apple ID if their own.