Halloween ideas?

I know it is a bit early but I am having a big Halloween bash this year for parents and kids. I need some spooky treat and drink ideas ( adult beverages as well). Also, what is a good costume idea for a family of 4 ( 2 toddler kids) ? We want to all be one idea. Also, game ideas ( I live on 1.5 acres so a lot of room to spread out)