Halloween is the only good holiday. It is the only holiday that doesn't involve large amounts of bullshit. Sadly however, it seems to be on the decline in resent years.
Halloween is great because of all the things you don't have to do. No gifts to buy, no bad meal to choke down, no family you hate anyway, no grand display of affection, no annoying false patriotism. While being a holiday, it shares in none of the worst parts that other holidays have. No one ever gets suicidal on Halloween, unlike some other holidays that could be named.
What Halloween does have is simple: candy, costumes, and Satan. Who doesn't love candy? Who doesn't think a costume one day out of the year could be fun? There is no Satan involved really, we just barrow some of his style for the holiday. It is a holiday without an ulterior motive.
Halloween is about fun, only holiday you can say that about. Christmas is about greed. Thanksgiving is about gluttony. Valentines is about lust. Halloween is just a good time, with some candy, and a bit of dress up. Shame that it seems to get smaller every year.