Ayutthaya trip guide, the best is to start at Bangkok's Hua Lamphong train station. Forget all other options since you will just get stuck in the gridlock traffic and spend half of your time there. Hop on the train to the north and have a interesting view into the rural live in Thailand.

Ayutthaya Trip Guide

Ayutthaya Trip Guide

Related
city center nightlife
Ayutthaya Trip
Bangkok to
   Ayutthaya
History
Hotels
New City Center
Nightlife
River Cruise
Temples and
     Monasteries
Pictures
Maps
According to the season there are farmers planting rice, maybe harvesting, water buffaloes with huge headgear laze around and kids are playing in the ponds. The trip Bangkok ot Ayutthaya by train takes only about 90 minutes and the train station is the end is almost beside the river channel around the island with the old town.
 
Some hotels are around there too
 
either it's a good location to stay and explore the city. Outside the train station are several tuk-tuk waiting. If you are only one or two ignore them since they will try to cheat you anyway and claiming commission from any place they bring you, which finally you have to pay. The best is cross the road to check the "motocyc" taxi easily fitting two pax, they bring you anywhere within the old town and new town for around up to Baht 50,-.

Since you probably are first time in the city the best is before you take a ride walk to the nearby Ayudhya Riverside Hotel and ask for a map they have a very good and simple map. If you are hungry now or later use their floating restaurant with a splendid view over the river and the ships cruising. An alternative would be to tell the motorbike guy to bring you to the Tourist Information Center.

To get a right orientation do an Ayutthaya cruise as a starter, the long tail boats are waiting at different locations. The best is tell the motorbike guy to get you to Chantharakasem National Museum, which is only about 5 minutes ride, now tour this small museum. The place give a good insight into the living of royalty at that time and plenty of items are on display including old Buddha artifacts, ancient weapons and in the center of the place is a watchtower with a excellent view over the area, the river and the channels, the historical park show more temples and artifacts than the historical park at Sukhothai.