Right after visiting the Grand Palace on the onset of its opening, we headed to tour the ancient city of Ayutthaya, known for its century-old temple and ruins. It's about 2 hrs travel from Bangkok when we got to set our foot on our first temple stop - Phra Chedi. This is I think the highest temple-mountain of the city and with that you need to climb steep stone staircases. I'm with my mom and aunts who managed to climb under the heat of the sun so I bet you will too! There is a minimal entrance fee here but I forgot how much; it won't go higher than THB50.
After touring the place, we stopped for a quick lunch over a nearby local eatery before heading to our last stop - Wat Maha That where the famous Buddha face relic on a tree roots can be found. The place is more ruin-liked and more spacious and said to be comparable with the ruins of Siem Reap temples though smaller in scale. Like with Phra Chedi, there is a minimum entrance fee here.
These are just two of the most important temples in the city. There are still a lot more to see. We just opted to visit two since we don't have much time. We were back in Bangkok before 5pm. Estimated time of visit for each temple is around 1-1.5 hour each. On this day, we rented again our airport taxi whom we used for our Floating Market tour for about THB2000-2500 since this is farther than Damnoen Saduak.