Yes, most hotel bookings are fully refundable if you cancel prior to the hotel's cancellation deadline, which in most cases is within 24 or 48 hours of your check-in date. If you have a non-refundable reservation, it may still be possible to cancel it and receive a refund within a 24-hour period of your booking. Plug in your dates, click on "Search", then you can use the "fully refundable" filter to get top deals close to Parque Nacional Canaima.