To answer Q 4.7 on application, is malaria classed as an infectious disease, & what is an "L Visa" ?

We will be on a ship cruise which calls at the port of Rabaul prior to two ports in China. Do we need to note this on our applications at 4.7 on the form?

Secondly, do we complete the standard application form for a tourist (L type) which we can download from the internet? Also, the ship calls at 2 ports for 1 day at each port. We are Australian citizens, are the fees for double entry still $45.00 each as stated on one of your websites? Must fees be paid in cash or can they be paid by credit card?