Biak-na-Bato - On the other side of the river along the left trail is a cave,probably the largest in the Biak-na-Bato area,that houses myriads of fruit bats. Visitors are warned against disturbing the bats with their flashlight beams and flash photography,but are encouraged to witness the amazing flight of the bats out of the caves at sunset.

How to get there:
All buses bound for the northern parts of Luzon pass through Bulacan.