Sukhothai and Sri Satchanalai:

Sukhothai is home to the most beautiful period of Thai Buddhist art. The Sukhothai Kingdom period was from 1238 to 1438 when it was absorbed into the Ayutthaya Kingdom.  Today the temple ruins are preserved as a UNESCO World Heritage Historical Park.

Blissfully quiet sites to explore.

Sri Satchanalai – 1 hour north of Sukhothai is very worthwhile to explore.
Enjoy peaceful paths by bicycle without crowds.

Getting to Sukhothai:
Sukhothai is not on the train route, but comfortable buses depart frequently from Mor Chit bus station in Bangkok- about 6 hour drive. Then continue by bus to Chiang Mai another 6 hours.

However train Bangkok to Phitsanulok is possible and then drive approx 1 hour or bus from there.
The Northern Train route to Phitsanulok stops in Ayutthaya along way and from Phitsanulok continues to Chiang Mai

Bangkok Airways flies between Bangkok and Sukhothai where they built their lovely boutique airport.

Accomodations:

In Sukhothai New Town:
www.rueanthaihotel.com