Updated: January 9, 2014
We took bus #53 on Phra Arthit Rd. to Hua Lamphong railway station - 7BAHT, then a 1.5hr train ride to Ayuthaya Station - 15BAHT. We walked straight ahead to a small pier for a short ferry ride to Ayuthaya Island - 3BAHT.
Renting a bike here would be a good idea to see all the sites. We ran out of time and we missed quite a few sites.