Just off the phone with one of the coaches from my club and he said that they are currently doing early season work to prepare for the track season, every tuesday and thursday evening down by The Tan or The MCG. I still have 2 weeks left in Melbourne so may as well make use of that while I'm here.
My coach said while travelling, if I can get 3 sessions a week in I'm doing good. He said that if on a given day I can get one in then do it, but not to be stressing about it and not to worry if I cant fit a session in on a particular day. Basically the days we may arrive into some town at 4pm and dinner isn't until 6pm and I have free time then he said I can easily fit in a good 45 minute session on those days. But when in the wilderness and camping I'm not to worry. He said the amount of trekking I'll be doing in Western Australia will provide a decent amount of endurance, and when hiking it can even help with strength. He said its obviously not 400m specific work, but that I should think of it as a form of cross training.
I did a fair lot of hiking when in South America and when I came to Melbourne after all that travelling I didn't feel out of shape.
He then tried to talk me into doing a decathlon with him later in the year.