Yes, most hotel reservations are fully refundable provided that you cancel prior to the hotel's cancellation deadline, which in most cases is within 24 or 48 hours of your scheduled arrival. If you have a non-refundable reservation, you might be able to cancel it and be given a refund within 24 hours of booking. Plug in your dates, click on "Search", then you can filter by "fully refundable" to view the best deals near Gruta do Barreiro.