Before you board the plane, it's a good idea that you see a travel doctor or health professional before you leave so you can discuss potential vaccinations for overseas travel, along with other preventative measures for local diseases.
You mightn't be aware that when you travel to Bali, a very popular tourist destination, you could be susceptible to Tetanus, Measles, Typhoid, Hepatis A and Rabies - getting the proper vaccinations for Bali will make preventing all of these easier.
There's also a chance you'll be stung by a mosquito, which could be carrying a number of diseases such as Zika, Malaria and most importantly Dengue Fever. A consultation with a professional will cover how to avoid being bitten, and thus how to avoid getting sick.
If you have any pre-existing medical conditions check your RACV Travel Insurance policy details to see if cover is provided automatically or if you need to apply for cover.