I never really did much for Halloween when I was a kid - we'd dress up and do apple bobbing at brownies, but it was very much a simple thing, only older kids trick or treated, and most of the adults didn't approve!
I live in Ireland now, and it's all about the small kids, houses are decorated, it's a lot of fun for the little ones, I quite like it.
as an expat though, the one that I actually find myself missing, and feeling sorry my kids don't get to do, is bonfire night. Freezing cold, miserable walk up a lane lined with cars from all the other families in the surrounding villages, in the dark with torches carrying a guy, into the field that got progressively muddier, Jacket spud, sparklers, the judging (never won), watching the fireworks, then they lit a massive bonfire and went round with a blanket for donations. It's changed a bit (glowsticks, no bonfire, just the fireworks, rarely guys, better food), but there's something about a load of people standing freezing cold ahhing and oohing at the same fairly rubbish fireworks display that takes me right back :D