My first initial thought when designing an icon to represent a holiday was to create an aeroplane. This was mainly because that is one of the first idea that popped in my mind.
Below are screenshots of how I created my aeroplane icon:
I first began by drawing the aeroplane using the shape tool. I only drew one half of the aeroplane then duplicated the shape before reflecting it so that it was symmetrical.
I then added a drop shadow