How to get to Pratunum pier from Asoke area?

The easiest way to get there?
Added (1). No toaxi whatsoever
Added (2). Would you consider it a good route? I just figured it out on my own by chance during my recent trip. I wanted to visit Baiyoke tower. So what I did. I got off at Paya Thai BTS station and walked a few meters straight from there until I saw a signpost: pratunum market 1000 meters from here. Turn right and walked straight. There I noticed Baiyoke tower, pratunum market(almost lumped together) and then I crossed the road to other side through walk over.
Added (3). There I saw Panthip plaza (bought a cheap Chinese made tablet using Samsung name but still working beautifully, cost me 2,500 baht) then i walked further I saw a pier (boat was going from there). But, I did not know it was called pratunum pier. Walking 1000 meters, worth it?

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