Hey, we got a taxi for $50, took 5 hours which included a stop for eating and some stops so i could shoot some village scenes and then took the boat back from SR to PP.
although the boat is pricey ( $25) it is well worth it as soon great stuff to see along the river and much more comforatable than the bus
same amount of time and you will be picked up from your hotel

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A good Traveler is one who does not know where he is going to,
and a perfect Traveler does not know where he came from.