1. Overdo the informal bow.
An angle of about 15 degrees is appropriate for most informal greeting bows. It’s not necessary to genuflect and skim the pavement with your forehead when someone merely hands you a packet of tissues on the street.
2. Show off your ink at the onsen.
Fancy relaxing naked in tubs of hot eggy-smelling water with total strangers? Before you do, cover up your taboo tattoos with sticking plasters or bandages as you may be mistaken for a yakuza kingpin and asked to leave.