This is a great way to travel from end of the high bridge across the Douro River down to the street level of Vila Nova de Gaia. Walking across the higher bridge (shared with the metro) offers a wonderful view of the Porto riverfront, and in Vila Nova de Gaia you have all the wine cellars for Port wine, so the full circuit is perfect. The Gondola is spacious, safe and a fun ride without being scary for anyone excepting those with a fear of heights. It does not rock. At the beginning someone snaps a photo and at the end it is waiting for you in a frame with highlights of the area. It can be a nice souvenir. Everyone I have taken on the ride ends up buying it! To return I always walk across the lower bridge that has the cars on it. The sidewalk is narrow, but if you are closer to the water and get a different perspective of the river fronts on both sides. Well worth it!