RE Island:
Some years ago, there was a remake of Romero’s “Dawn of the Dead”; at the very end (in the outro while the end credit music rolled), they got a boat and found an island. The boat was out of fuel, so they were kind of f*****. As they pulled up to the dock, the dog they had with them leaped out and ran into the brush... and was chased back by a horde of ravenous dead.
In that scenario... there is nowhere to run to.
I think I saw parts of that flick. Well, a “clear” island needs to be picked. :)