immigration authorities may request visitors and transit
passengers to prove that they will depart from the country within the prescribed period, by showing a return or onward ticket to their next international destination.
Unless stated otherwise, return/onward ticket is defined as:
a. International airline ticket (i.e. any types of airline
tickets, reservation confirmation, booking code etc.); or
b. Evidence of departing from the country by other means of
transportation (e.g. confirmation of joining a cruise, train,
bus or ferry tickets, proof of departing by private boat or
plane, etc).