I'd have to say all of them; each is fun/family-oriented/has special memories. They're all unique and each is my favourite. I like Christmas for the family time and our traditions, Halloween because it makes me feel like fall is coming (yay!), Easter for the warm weather and the colourful flowers... the list goes on. I can't say Thanksgiving is my absolute favourite because I think of all the dead turkeys... but it's still great!