I'm going to Houston (Texas) for a week as part of the Young Astronauts Australia Engineering School, staying at NASA's Johnson Space Centre. We spend some time just wandering around Houston, which brings me to the point of this thread:

Is anyone here from Houston? Has anyone here been to Houston? What is there to do/see in Houston?

It's my first time going overseas, and I want to know what to do in my spare time to make the most of this rare opportunity.