Ohh sounds great! 4yo parties are great fun! We played Duck Duck Goose, What's the time Mr Wolf with the kids and they had a ball. It was good as there was no winner as such as I have found that they still do not cope very well with this concept of missing out! I am sure there are other games as well but my mind is a bit blank.
Honey joys and Choc crackles are always a winner with the big and little kids too.
Have a great party!!!