If I still had access to my transportation, I would head to a superstore to stock up on gear. I'd cautiously investigate to see if there was somewhere I could help with a reasonable expectation of not making myself into someone else for others to rescue. If I could help, I would. If I couldn't help, I would hole up somewhere until an organized rescue effort was underway, at which point I would join it.

If there were aliens trying to kill me, and I couldn't escape, I guess I would fight aliens and probably get killed. I'm no pushover, but neither am I a superhero.