How do you answer this question correctly in spanish Que le gusta hacer para celebrar el dia?
"¿Que le gusta hacer para celebrar el día?" means "What does he (or 'you' if speaking formally) like to do [in order] to celebrate the day?" possibly referring to a holiday or birthday or even a day of the week.
To answer the question you can say: "me gusta ver fuegos artificiales" ("I like to watch fireworks") for 4th of july
"me gusta celebrarlo con mi familia" ("I like to celebrate it with my family") for christmas.
So it really depends on the context of the question in this case.
[...] represent text added to the "literal" translation in order to make the English translation clearer.