Question

The whole family are planning to .............. to Australia later this year. (fill the blank space and if you can add more than just one answer please)

Answer 1

I think that the word "are" should be replaced with is before I start giving you answers. 
Your rephrased sentence would be: The whole family is planning to ........... to Australia later this year. 
some good replacement words would be:
travel
hike
I suggest you use this sentence: The whole family is planning to travel to Australia later this year.