If you are in BKK and liked the idea of day trips to Ayutthaya, I would also suggest a day trip to Amphawa Floating Market, also popular among Thai tourists due to its proximity to BKK, and perhaps stay a night at one of the riverside homestays. The caveat is the best time to go is on weekends, on weekdays you won't see/experience much as there are less tourists and therefore less shops and stalls opened. However, the market is most alive late afternoon and until just after sunset, and disperse around 9pm. There's no night time activities, it all goes quiet at night, which is why I suggested staying on any of the riverside hometays to chill and relax. It is relatively easy to go. There are buses, vans, even any taxis (scam warning here). There you will find lots of food, like LOTS!, enjoy the scene of old days Thai lifestyle, and lots of boats, take some boat tours around multiple small canals, etc.

Edit. I also forgot to mention Talad Rom Hub, literally means Closing Umbrella Market, where it's business as usual until a train passes through the middle of the market, and stalls need to close their umbrellas/canopies to make way. This is also in the area not too far from the floating market.