You cant visit houston and not go to the space centre. It was well worth the visit. It was very informative but also fun. Make sure you do the tram ride to see the control centre and the rocket. Theres a massive food court there catering to all food types. The staff are really helpful and have a lot of knowledge about nasa. As a person that doesn't drive I relied on public transport and it it still easily accessible. Just dont miss your last bus back at 5 though.