You can install the Google+ app on the iPad, even though it's "sold" through the iPhone area (it's actually a free download). Once it's installed, you can press the "2X" in the lower right corner to make it fit fully on the iPad screen. Oh, and you can only use it in portrait mode.
I don't have a Google+ account, so I didn't go any further, but it looks as if it'll work. Give it a try?
Marilyn