Leave Amphawa ?
To get back to bangkok from Amphawa, the most practical is option is to take minivan number 996. You have two providers almost side by side near the bridge a few meters from the entrance to Amphawa floating market parking lot. They will take you to Pinklao or Sai Tai Mai, Bangkok Southern Bus Terminal (70 THB, 2 hours) or to BTS Bang Wa station. If you can, arrange it with your hotel or homestay. If you do not want to sleep in Amphawa and return to Bangkok in the evening, the last minivans leave Amphawa at 8:20 pm. In this case, I advise you to buy your ticket as soon as you arrive in Amphawa to be sure to have a seat because on weekends, these vans are very popular of course. Alternatively, you can go to Bangkok by first going to Mae Klong with the blue songtaew or bus number 333 (the last one leaves at 5:30 pm), this may be the opportunity to see the railway market there, and from there take a van to Bangkok Southern Bus Terminal (Sai ??Tai Mai) or Pinklao at the city bus station or take a minivan to BTS Mo Chit station in Bangkok in front of Alongkorn Hotel 2 a little after the railway market.