I'd opt for the the lighthouse - great views, love the ocean, I could read and watch whatever TV or movies I wanted without someone else trying to change the channels. I would like to have a dog with me though - if that was the case I would be all set.
Not Antarctica - don't like the cold or the space station - not sure I would like to be in an environment where it was unnatural for me. Especially thinking of the food, and other stuff you need to handle with little gravity.
The lighthouse would be awesome though.