Yes, you'll find most hotel bookings are fully refundable provided that you cancel before the accommodation's cancellation deadline, which is usually within 24-48 hours of your scheduled arrival. If you have a non-refundable reservation, it may still be possible to cancel it and be given a refund within 24 hours of your booking. Add your dates and click on "Search", then use the filter option "fully refundable" to get the best options available near Katmai National Preserve.