Any ideas on what to do while babysitting?

I am babysitting 2 boys: a 8 year old and a 5 year old. I will be babysitting after dinner for about 4 hours. Its snowy here in minnesota but the snow is just too hard and not much is out there to have fun in it. This will be the first time I am babysitting these boys and i need some creative suggestions!! thanks!!