However I'm in need of some suggestions on how I can make it truly fun and enjoyable for them. I want this day to be filled with laughter excitement and lasting memories. but don't really know what to do excalty.Do you have any suggestions for activities that I can organize for the kids
Depends on age of those kids, you will have to organize different things for them. Mindset of kids changes a lot just after 6 months or 1 to 2 years and if you have kids, you will recognize that. Change in mindset is part of their growth and you can not force a 6 years old kid to play a game for 4 years old kid, it's not funny and exciting at all.
Perhaps a game that teaches them about Bitcoin while keeping them entertained? Or any other ideas that could make this day extra special for them?
Makes something funny for them and don't always think about Bitcoin because you are in Bitcointalk and your kids and friends have to play games about Bitcoin.