According to forum posts, travelers have several options for reaching Ayutthaya from Bangkok. Some travelers recommend taking a train from Hua Lamphong Station or Bang Sue Station, which are both affordable and straightforward. Others suggest hiring a tuk-tuk upon arrival for local transportation around Ayutthaya, which can be negotiated down to about 200 baht per hour. Additionally, renting bicycles is a popular choice for exploring the sites at one's own pace.

Travelers have noted that Ayutthaya can be extremely hot, especially around midday. It's advisable to start exploring early in the morning and consider scheduling indoor activities or breaks during the hottest part of the day. Checking the weather forecast is crucial as it can influence transportation options and comfort during the visit.

For many users, planning the visit to Ayutthaya involves deciding between a self-guided tour and joining an organized group. Self-guided tours offer flexibility and the opportunity to explore at one's own pace, often making it a preferred choice. However, some suggest that hiring a local guide can enrich the experience, providing historical context and navigating the sites more efficiently.

From the discussions, staying overnight in Ayutthaya is recommended by some travelers to fully experience the historical city without rush. This allows for an early start to visit sites and enjoy cooler morning temperatures.

According to forum posts, train travel from Bangkok to Ayutthaya is possible from multiple stations including Hua Lamphong, Bang Sue, and the new Krung Thep Aphiwat Central Terminal. Travelers have highlighted that third-class tickets are economically priced starting from 14 baht, and the journey generally takes about 1.5 hours.

Some users mentioned that for express diesel rail cars, it's advisable to book tickets in advance, especially for second-class seats which offer air conditioning. However, for other train types like ordinary slow trains or rapid trains, it's possible to purchase tickets directly at the station on the day of travel.

Travelers have called out that there are frequent train services from Bangkok to Ayutthaya, ensuring that missing a train doesn't cause much delay, as another one is usually available soon. Some trains are noted for being more punctual than others, with the services from the Chiang Mai line being particularly reliable.