Arriving to our River City location by the Chao Phraya Express Boat (http://www.chaophrayaexpressboat.com/en/home/) is a good option from the Khao San Road area.
Catch the southbound boat (going from right to left) with an orange flag from the Phra Arthit Pier (N13) near Khao San Road
Get off on the Si Phraya Pier (N3) right next to River City
Walk down the alleyway, take a left at the end, and walk 200m to our office near the exit ramp of the parking garage
This trip should take you around 30-40 minutes at the most and there won't be the uncertainty of hitting traffic. Tickets can be bought on the boat at costs no more than 15 THB per person. For tours starting at 07.00 we would recommend taking a taxi as traffic is light and the first boat might arrive with a delay.
Alternatively, our secondary Bangkok location (Tha Phra Chan) is located a convenient 15 minute walk from the Khao San Road area.
Tours leaving from Tha Phra Chan location
https://www.covankessel.com/bangkok#THAPHRACHAN
Location & directions to the Tha Phra Chan location