Booking a Oneworld Explorer ticket in the Oneworld tool. I have Sydney SYD, Tokyo HND, London LHR, New York JFK, <24hr in Chicago ORD and then I run into problems.

I would like to spend several days in Kona KOA on the way back to Sydney SYD so I've continued the itinerary from Chicago ORD, Los Angeles LAX, Kona KOA. That worked OK.

Now I'm booking KOA back to Sydney and not getting any options. I could see there was a Qantas flight from Honolulu HNL to Sydney SYD, so I made Kona KOA to Honolulu HNL a surface sector thinking I would have to buy that as a separate one-way ticket but then the Qantas flight does not show up.

Ideally I want to travel back from Chicago ORD to Sydney SYD with a 3 day stopover at a beachy island (Hawaii, Vanuatu, Fiji etc.) or I am also willing to consider somewhere else beachy (thinking Mexico, Caribbean, SE Asia maybe?)

Any thoughts ?