I think Halloween can be as innocent or as sinister as you make it. I know that even Catholic schools before the council celebrated it on an innocent basic level. My grandma went to parties with her friends and they bobbed for apples and played games, people who were good Catholcis with good reputations participated, so I don't really worry about what other families do.
We do not celebrate in our home. Tomorrow, we will set up a small home altar in honor of the Holy Souls. We will make a list of faithful departed, pray, and sacrifice for them for the whole month. I have a system for anonymously tracking good works and extra prayers, so we can see our collective spiritual bouquet at the end of the month. In less busy years, we dress up like saints and attend or host a party.
I bake a lot of stuff with pumpkin in the fall. I'm thinking about having a traditional Martinmas party next year. That's about it.