if you have ANY ticket for leaving in the next 24 month after your arrival you wont have any problems.
Anyway, the PI don't care at all when you arrive here as long you bring money to the country.
The only problem you ever would have is the check in at your own country as the airline is responsible for bringing passengers legally to another country.
So to answer your question: No problem, you can get your visa-waiver (entrance-stamp to 59 days) at each immigration office.
cheers
Rhoody |