I also pack:
car activities such as colouring in, ipad, music, and I just bought a deck of cards called "50 things to do in the car"
snacks for trip
wet ones IN the car
sunscreen
hats
socks
shoes
given I know you're worried about the weather at your destination - boots for the beach so they can still play on the beach
beach towels (unless Aunt has some there to borrow)
undies for each night + 1 spare for each toilet trained family member - more for those who are still learning
PJ's
i always pack DD's fav bed buddy AND one of her little pillows which she uses in the car as well
mix and match clothes for sure! stuff you can layer
any medicines you are all on
pandol
bandaids
hair brush/comb
shampoo and conditioner
soap
toothbrush and paste
mobile ph + charger
camera
beach toys (bucket and spade)
PLASTIC BAGS! great for rubbish in the car and wet/dirty clothes/toys
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