I pedaled all the way from Novaliches to Barangay Bayabas, DRT, Bulacan. That's about 45 kilometers one way.
But, I reached up to the river only. I didn't venture going to the cave anymore; as the way after crossing the river is no longer bikeable.
As I turned around to pedal back, a group of bikers was arriving. I just say hi to them and left.