I rented a car from Avis because my company gets an amazing deal and I don’t pay extra for one way rentals. We did this a few years ago and just took a taxi to the car rental place. They open at 9 am so I will be able to take my time getting off the ship and still get to Space Center Houston for several hours before our 6 pm flight. Previously we went to the Houston Zoo but this trip will be mid August and considerably warmer outside.