Swimming with whale sharks. Register at the Visitor's Center located at Barangay Dancalan. Shark watchers are assigned a Butanding Interaction Officer and have to follow strict guidelines. All whale shark tour boats are provided by the center inclusive of an interaction guide called a Butanding Interaction Officer or BIO. Some resorts can do pre-booking for a minimal service fee. Price is ₱300 (₱100 for Filipinos and local residents with ACR card) for the registration (valid for 5 days), and ₱3500 per boat (up to 6 people). There is no guarantee of seeing a whale shark the chance of seeing them have now (March 2018) become almost zero. Boat operators will take you out even if no Butanding have been sighted for weeks and they will not tell you of this beforehand. No refunds or credits. Avoiding weekends and booking multiple days increases your chances of success.