safetypee,
Upslope runway, ie; approaching a runway where the threshold is lower than the far end.
This particular runway was on the immediate coastline and perpendicular thereto. The only viable approach was from the water, landing uphill.
No obsticles on takeoff, at the end of the runway was the beach.
This particular airport was a public facility, but unattended normally.
Transportation was there for our pax (and crew), but otherwise, no one else...or so I thought.
Out of the weeds walked a perfectly dressed governmental official, wanting the overflight and landing fees...cash please.