Interesting thought experiment. I'm not sure how I'd react. Assuming the planet was safe - air, temperature, no space tigers about to eat me - I'd probably explore. I'd love to see what kind of technology another intelligent species might have (and if there's a way back to Earth, I'd love to bring their ideas by "inventing" them here.
)
Oh, I'd also love to see what their nighttime sky looks like. Any cool constellations? Multiple moons?