What happens when the runway is unusable at an isolated aerodrome?

What happens when you fly to isolated aerodrome in turbine engine aircraft without predetermined point procedure and just upon arrival for example an aircraft crashes on the runway and you can not land, you have fuel for 2h of flying due to fuel reg when flying to isolated destination aerodrome and what happens next? Is there an requirement for isolated aerodrome to have maybe 2 separated runways? Or something else...