Yes, most hotel reservations are fully refundable as long as you cancel prior to the hotel's cancellation deadline, which is often 24 or 48 hours before the scheduled arrival. If you have a non-refundable reservation, you might be able to still cancel and get a refund within a 24-hour period of booking. Plug in your dates, click on "Search", then filter by "fully refundable" to view the best options available near Playa de San Lorenzo.