All of that said, if you're looking to capitalize on motivation you have to bring something to the table:  all cash-offer, high EMD, <30 day close, 3 day period to do an inspection, etc.  

There are also some unique toilets for confined spaces.

Remember no hard feelings or emotions just go back to the negotiation table and tell him your terms.  

One of the first things we learn after our training when we're "in the wild" is how to handle the scenario where our buyer clients are at risk of leaving money on the table for someone else to pick up. 

Once you have a name you can begin to turn the tables a bit. 

So if the estimate to repair was $10,000, you would need $35,000 to come to the closing table. 

Unique Amenities that help in bookings?

Some quick searches seem to indicate that the market in Oahu is somewhat unique (rules limiting short term rentals, lots of leaseholds, etc.).  

Everyone's personal preference is unique but as Thomas S. mentioned, I would never pay off a mortgage.  

In the beginning, do not do anything unique.