Travelling to Tonga, you need valid passport.
We wish to recommend you to check in advance, before you leave, at Tonga Embassy abroad, if the conditions for the entry and stay in the country did not changed in the meantime.
The citizens of European Union receive automatically tourist entry visa (in a moment at their arrival to Tonga Kingdom) by means of a stamp into passport, free of charge, for time period of 30 days. The visa could be prolonged, after payment of the respective fee, and filling in the application form for visa prolongation.
Next information could be got at Consulate General of Tonga Kingdom in Australia:
Consulate General of the Kingdom of Tonga
158, Pacific Highway (P.O.Box 258)
North Sydney 2059
Phone: 0061/2 9929 8794
Fax: 0061/2 9929 6778
Information and warnings on travelling abroad is to be found HERE.