It is obvious that "do what the locals do" should not be taken literally, because locals are likely working most of the day. So the authors actual advice seems to be "avoid what the locals do, when they don't want to do anything". Everyone else likely interprets it as "do what the locals do, when they want to have fun" which is good advice.

My daily routines are of no interest to tourist. They are probably similar to their own routines at home anyway. When I got out on the weekends it can get wild though and I'd wager it's exactly what many tourists are looking for.