Certainly! Visiting Sydney, Melbourne, and Adelaide can be an exciting experience. Here are some travel tips for your Australian journey:

Best Time to Visit:
The best time to visit Sydney and Melbourne is during the Spring and Autumn seasons (Sept-Nov and Mar-May). The climate is mild and outdoor activities can be enjoyed the most. For Adelaide, the ideal time to visit is between March and May when the summer heat has cooled off, and the winter chill hasn’t yet set in.

Route and Accessibility:
Major international flights connect to Sydney, Melbourne, and Adelaide. There is also a well-connected network of trains, coaches, and flights for inter-city travel. Car rentals are also popular for road trips.

Altitude and Acclimatization:
All three cities are at sea level, so there's no need to worry about altitude sickness or acclimatization.

Accommodation and Booking:
Accommodation ranges from luxury hotels to budget hostels. All cities have a good Airbnb presence as well. It is recommended to book your lodgings in advance, especially during festivals or events.

Clothing and Essentials:
Pack according to the season. Summers require light clothing, hats, sunscreen, while winters need warm layers. Comfortable shoes are a must for city tours.

Health and Safety:
Australia has one of the world's highest standards of living, so food and health safety is usually high. Drinking tap water is safe too. In case of emergency dial '000'.

Local Etiquette and Respect:
Australians are known for their casual and friendly nature. A simple "G'day" which is short for 'Good Day' can go a long way as a friendly greeting. Tipping is not obligatory but appreciated for good service.

Remember to respect the rich indigenous culture and traditions, especially when visiting heritage sites.