I really enjoyed the city tour and the sites of Houston. NASA was a good tour as well except for the lines.
I loved this tour. The city tour guide was very knowledgeable about the history of Houston and was very funny. After the city tour we were sent on another shuttle and driven out to the space center and had approximately 4 hours to explore on our own. The driver then picked us up when he said he would and took us back into the city. It was coordinated very well.
Great Tour highlighting the history of Space Exploration. City Tour of Houston was informative and a great way to spend a day in Houston