Alright... So, I was actually going to make a whole website in Unity... and I though of how to goto different pages...
So, I'd do some GUI work, and make it when you push the buttons to go to a certain object, it moves the camera for you to a certain spot...
To do this, I'd use:
http://www.unifycommunity.com/wiki/index.php?title=Spline_Controller
It's easy to set up, make the camera the object that moves, and have certain "nodes" enable for whatever item you'd want....
Other than this.. You can use the build-in accelometer...
http://www.google.com/search?hl=en&client=opera&hs=ZiH&rls=en&channel=suggest&sa=X&ei=cHGUTcrmHY2Q0QHwu5j4Cw&ved=0CBQQvwUoAQ&q=accelerometer+ipad+unity3d&spell=1
Might be harder, but could work...
Another idea would be to have like, and "On-screen keyboard" so you can move by pushing the buttons, which would be like...
if input is w -> make player go foward
if input is a -> make player rotate left
if input is s -> make player go backward
if input is d -> make player rotate right...
This can work pretty well, just mix the GUI with some transform/translate, and you can get that...
But any of these could work... Depends on how much work you're willing to do =). And sorry about the 2 links, it's how I answer questions... Not a fan of giving people code as I don't like to write code for people.... I find that it's like giving a man a fish.... They should be able to fish so then they can help others... You know?