Google Cardboard is definitely a unique experience.
There are a number of applications that work with Google Cardboard that satisfy a variety of needs, from roller coasters, to scenic walkarounds, to haunted houses.
There are even applications that allow you to use Google Cardboard with your phones camera to sort of augment your reality. There is an NFC chip where you insert the phone, which allows your device to instantly recognize the Cardboard viewer.
Putting together the cardboard with just the instructions printed on the unit itself is harder than I thought it would be. Just go to the BrizTech website and see instructions there. There is a short video that will show the steps. It does not talk about attaching the headband, but you can just attach that to the inside or outside of the units sides.