IF you are staying in a hotel phone and check to see if you will have a bar fridge available...or microwave. Bring a few snacks. Because you don't often want to run out just for something like sultanas if you can help it Whenever we have travelled I've packed enough for 1 extra day. With Melbourne, I would pack extra warm clothes and a t-shirt jic.

I bring a nappy bag packed for a full day out for the plane trip & then I pack a small bag for the kids (one each) with nappies, clothes & sleeping gear. I pack all the bathroom stuff together for the family with a spare washer for the kids. I also pack a few extra toys for when we get there & I always buy them something small to play with for plane travel. So something like a sticker book... toy plane etc.

HTH