you could try some mini muffins or mini quiches. I make mini quiches using a recipe for impossible pie - makes it really quick and easy.
Cheese sticks and crackers with chopped up vegies and fruit as mentioned by other mum. You could slice the cheese and then use cookie cutters to make cheese shapes. You could make some guacamole dip for the vegies too.
Little sausage rolls.
You could do fruit and yoghurt in little individual serves.
Little iceblocks are good, depending on weather I guess. You can make them using yoghurt and berries and freeze in icecube containers or iceblock moulds.
A nice drink is blackcurrant syrup with flavoured mineral water. Not the healthiest perhaps, but very yum.
That's all i can think of for now. I hope you have a wonderful time.
WA - gorgeous little girl