Seeing the entire city of Houston in one day is virtually impossible. However, there are certain places that you must visit, if you find yourself in Houston only for one day.
The best option is to purchase the Houston CityPass that offers tickets to the top six attractions in the city. Each 'Pass' is actually a booklet that includes tickets to the attractions, attraction information, transportation directions, and the best times to visit. The attractions are: Space Center Houston, Downtown Aquarium, Houston Museum of Natural Science and the Houston Zoo. Optional tickets to The Health Museum or George Ranch Historical Park and The Museum of Fine Arts or the Children’s Museum of Houston, are also included. The CityPass costs $39 for adults and $29 for children aged 4-11.
Visit the website below for more information on the CityPass: