Exploring Phitsanulok And Sukhothai, Thailand
My aim was to spend a few days exploring the lower provinces of the North of Thailand, with Phitsanulok and Sukhothai as the primary destinations, and in specific the Sukhothai Historical Park.
I eventually chose Phitsanulok as the very first spot to see, and also decided to go by vehicle. Even so, from Bangkok, you can also get an air-con bus from the Mor Chit two terminal, or take the train from Hua Lamphong railway station.
Just as a modest side note, I locate the trains in Thailand to be very comfortable and exceptionally good value for income. But I do recommend that you book your ticket beforehand. Other stations in the North of Thailand are at Lampang, and, of course, Chiang Mai.