"I want to go to Australia in the summer."
I agree with what @sora_Japan said about “ikunoga hoshii” not existing in Japanese. However, I want to add that there is one construction that uses ほしい with the te-form to imply that we want someONE to do someTHING.
この映画を見てほしいよ。 I want you to see this movie.
彼に歌ってほしい。 I want him to sing.
Please correct me if I’m wrong.