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A lot of times when you hunt with a bow you find yourself in a situation where you will have an animal below your treestand but you can't shoot because it's too dark. Is there any scopes that are made for bows that are night vision? Or is there any way that I can modify a regular night vision scope that I would be able to use correctly on a bow?

They make lighted sights for when it gets dim. I have one on my bow.They also make lights for night hunting Like for hogs and varmits.They screw into your stabilizer hole on your bow riser.
Check your local laws some states are very strick about lights and lazers.
I dont know of any night vision that is readily adaptable

I want to buy a night vision device, but I am trying to decide between a monocular, or a binocular, both of which would be head-mounted.

What are the advantages and disadvantages to both?

Here are the specific models I'm looking at:

http://www.atncorp.com/units/nightvision/nightvisiongogglesandbinoculars/atnviper

http://www.atncorp.com/units/nightvision/nightvisiongogglesandbinoculars/atnnightscout

They will be used mainly for fun, possibly for airsoft and generally just jacking around.

When spotlighting its real easy for someone to look out and see the light and call the cops on you but i use mine to locate the deer and then just use the light for those few seconds that i need it. It makes things a lot easier and alot more successful.