Thanks for all the advice.

As far as I know I must stop where I started, that is CAI. Maybe it better to to drop one continent?
I only have appointments in South East Asia and LA so all the other stops are negotiable.

There should be some execellent WW2 wrecks off the Northern Coast of Australia - that is Darwin I guess (perhapps with fresh water crocs). Cairns might be ok too.

The trip is intended to take place next spring.