From the HCT Visitors Center, explore Houston on a 75-minute loop hop-on Houston sightseeing tour, which travels by double-decker bus to six stops around the city including Convention center, Minute Maid Park, Historic District & Market Square, Downtown Aquarium, Houston Heritage Society park, financial district, Midtown and more. Enjoy unobstructed views of breathtaking architecture and live onboard commentary, and simply hop off at any of the six stops to sightsee in depth. Experience Houston's most noteworthy attractions, sights and shopping areas at your own pace with this convenient Houston city tour.? Alternate vehicles may be used according to number of passengers, weather or traffic conditions.