Sanam Chai MRT Station

If you're staying anywhere near the river and dreading the taxi lines, this is the stop that solves your problem. It sits on the MRT Blue Line and serves the historic riverside side of Bangkok, so you can skip the surface traffic entirely and come up in the older part of town rather than crawling there in a cab for forty minutes.

Underground, it works like the rest of the Blue Line, air conditioned, straightforward ticketing, platforms built for steady crowds. Single-journey tokens come out of the machines by the gates, and if you're going to ride the MRT more than a couple of times, an MRT stored-value card saves you waiting in line every trip. Worth knowing that this is the MRT's own card and won't work on the BTS Skytrain, which runs a separate system.

The one thing I'd plan for is the walk at the other end. The street layout around here isn't a neat grid, and the exits don't all lead where you'd assume, so I'd have your destination pinned on a map before you come up the escalator rather than working it out at street level.