Yesterday in Bangkok we went to the massive Chucatuchak market early in the morning. Taking a taxi was a bit pricey compared to trains or buses but got us there fast.
Early meant avoiding the later crowds which were really buiding by the time we left, but some vendors were not even open. But with 8000 stalls to choose from we could miss a few. We also never found the grilled platybus food stall again when we decided it was time to eat. Maybe it was just as well. We did find some great squid though and other snacks like coconut juice from the shell.