First of all I want to say "hello" for everyone. 
In the middle of November I am flying to Melbourne. One day in Melbourne I want to reserve for diving and in this case I will be grateful for any informations about good divecenters and underwater locations there. It might be wrecks or reefs.
Ok, in the next step of my trip I am going to fly to Cairns and spend 4 days / 3 nights liveaboards. So, tell me which divecenters in Cairns are good and noteworthy. Of course the divecenters migth be located near Cairns, but I want to spend 4 days on the boat, diving on Great Barrier Reef.
The one of the main things for me is best value for money. 
So, I will be very grateful for any informations.
I have got TDI Advanced Nitrox Diver, but I won't make any technical dive in Australia, just recreations.
Thanks a lot and regards,
Kuba

In the middle of November I am flying to Melbourne. One day in Melbourne I want to reserve for diving and in this case I will be grateful for any informations about good divecenters and underwater locations there. It might be wrecks or reefs.

Ok, in the next step of my trip I am going to fly to Cairns and spend 4 days / 3 nights liveaboards. So, tell me which divecenters in Cairns are good and noteworthy. Of course the divecenters migth be located near Cairns, but I want to spend 4 days on the boat, diving on Great Barrier Reef.


So, I will be very grateful for any informations.

I have got TDI Advanced Nitrox Diver, but I won't make any technical dive in Australia, just recreations.

Thanks a lot and regards,
Kuba