Pagsanjan is a town in Luzon, the chief island of the Philippines.
Pagsanjan (pronounced "pag-san-HAN") is on a river of the same name.
You can take a bus from the Buendia bus terminal in Manila to Santa Cruz. It takes about 2-3 hours, depending on traffic. The buses leave very frequently, and the bus fare was 123.50 pesos as of March 2008. A cab driver in Manila should be able to direct you to the correct bus terminal. The last bus returning from Santa Cruz to Manila leaves at 7pm.
Once you arrive in Santa Cruz, you can take a jeepney to Pagsanjan for 10 pesos per person (as of March 2008).
Take the jeepney to the tourism office -- they will direct you to the river and find you a boatman.
Up-river from this town is Pagsanjan Falls. It is a moderate-sized waterfall (perhaps 15-20 meters), but very pretty. The trip there is mostly through wild jungle in a deep canyon. Very scenic. If you are fortunate you may even see monkeys in the jungle along the canyon walls.
Pagsanjan Floating Station and Restaurant. A package (including transportation from Manila) can be booked through AVA Sightseers, 0917-648-8382. Ask for Alex or Angel. If you wish you also can have a dinner on the river (included in one of the packages).