Hi and thanks for the add... going for 3 week holiday to BKK in a few weeks but plan on going back for 3 months in August... I have Aust passport , do I need to apply for tourist visa to stay for 3 months as I would like to do some travelling around Thailand.
TLDR : Answer Summary
An Australian passport holder can enter Thailand for up to 30 days without a visa. However, for a longer stay of 3 months, it is advisable to apply for a tourist visa before arrival. A 6-month visa might also be an option if you plan to stay longer in future trips.