In an emergency near a remote island is it better to land resulting in the airport closing or ditch in the water? Consider a landing at a remote island (like Easter Island or perhaps one with a calm lagoon, like YLHI) in which the aircraft is likely to crash and close the airport. (For example a gear-up landing at a single-runway airport.) Under these circumstances would it be better to ditch than to attempt the landing at the airport, thus keeping the airport open for emergency aircraft?

If the above question is unanswerable: Has there been advice issued from an aviation safety authority regarding such a scenario?
In general, it's a bad decision to ditch if there's an alternative, even a gear-up landing (Sully ditched in the Hudson because the alternatives were much worse: virtually certain total loss on board, plus significant ground casualties due to dense population).  The safety of the crew, passengers (if present), and people on the ground is the first concern of a captain or PIC.  Ditching seldom ends well, and often results in 100% fatalities, because even with a perfect ditch, rescuers often can't reach the aircraft quickly.

For a sufficiently remote location that incoming flights may not be able to return or divert (like the example, Easter Island), there may be an option to land alongside the runway (potentially a better choice for gear-up anyway, in a location without a large fire crew, since grass is less likely to start a fire than tarmac), both for safety and to keep the runway open.