Depends on how you used your iPad. Do you have a lot of personal information on it? Did you use it for your bank accounts? Is it setup to your email and if so what is in your email inbox? Just some rhetorical questions to get you thinking. I'd definitely change all of my passwords with anything that I signed into from the iPad.
quote: It's a wifi only iPad so I can't track it unless connected to Internet.
I thought it was common for the device to be connected to wifi to track it.