Beside a rough dirt road just beyond MacArthur is the well-hidden Bukilat Cave . The road you want heads north from Tudela, then east, passing the Calmante Elementary School about 4km along. A sign for the cave pops up once you’re almost there. The entrance fee is payable at the nearby waiting shed or shop.
One inky-black corner is apparently the start of a long passage through which an underground stream flows. If you’re up for the swim, it can be explored properly providing you can rustle up a guide and some torches (flashlights).
