The 90-minute double-decker bus trip afforded some useful views of the Houston skyline and central downtown area. However, there is not really much to see other than some colorful murals - very few shops or street life. The trip out to the NASA Space Center was efficiently run; the Space Center itself is impressive, of course, with much history and explanations of the space program. It is organized in a way that involves long waits for the trolleys to shuttle one around to the different areas. The weather was cool and sunny, but in warmer weather these long waits would have been really unpleasant.