I am travelling to australia in November 2014 and what about visa issu?

We both hold valid Irish Passports

My travel arrangements are as follows:
Dublin to Hong Kong for 7 days
Hong Kong to Shanghai for 2 days
Cruise from Shanghai to Vietnam, Cambodia and Signapore for 8 days
Flight from Signapore then to Australia for 3 weeks

Do I need it cover far east trip?

Thank You