Can you cancel a sun holiday?

Excuse me, I was just wondering, is it possible to cancel a sun holiday that I've already booked? I'm curious about the policies and procedures involved in doing so, and if there are any penalties or fees associated with cancelling a holiday package. I'm hoping to find out if I have the flexibility to change my plans if something unexpected comes up, and what steps I would need to take to go about cancelling my sun holiday. Thank you for your assistance.