Calauit Game Preserve and Wildlife Sanctuary is about three hours of rough roads from Coron (and a 5-30 minute boat ride, depending on where you started and what your boat is like).
Personally, going there isn't worth the long hours on bumpy road, mainly because the sanctuary is not really that maintained anymore. Plus, the locals have been hunting the deer running wild and free for their meat. But of course, something has to be said about seeing all these animals we usually just see in zoos roaming free, with expanses of land to themselves, to go about and graze as they please.
The sanctuary has a long way to go to catch up with other similar ones (like ones in Africa, ustralia dn some parts of Asia), which is too bad really because it is such a huge, rich island where animals are sure to thrive.