Here’s an idea from my journal. Let me know what you think in the comments, Facebook, email, contact form, whatever:

Rock climber in Colorado. He watches another climber shimmy up an iced face. The other climber makes a move so fast the watcher almost doesn’t catch it. But catch it he does. It was a move impossible for a human to make.

What does an alien do when stranded on a planet not his own? When he has a long life, and needs to hide out from crowds of people? Learns how to be a mountaineer, of course. Find out how one man learns his secret.