He doesn't say go to Khao San to relax. He says go, grab a beer, chat to other travellers and make travel plans. Khao San is good for that. It's like the budget travel hub for SE Asia.

> However, I recommend going there during songkran at least once in your life.

Hah. Did this by accident, had no idea what was going on, it was mental. Pro tip: Don't carry any non-waterproof electronics with you. :P