Apart from its exceptional natural charisma, Phitsanulok provides visitors with an opportunity to explore notable chapters of Thailand's history. Phitsanulok is therefore a natural hub and an ideal base for travelers wishing to explore the lower North and western Northeast. However, Phitsanulok is more than just a stopover for tourists; it is a province with a number of tourism opportunities. While most of Phitsanulok's terrain is flatlands, one third of the area is covered by mountains in the north and east, where national parks and waterfalls await exploration.
(http://www.tourismthailand.org/where-to-go/cities-guide/destination/phitsanulok/)