I would give exactly the same directions to the museum. On foot, it is about 20 minutes and you walk right by the sea until you find it. You go past the hospital and then you see the museum on your left. Except for a taxi, there is also bus Number 5 which you get on the main road you see after you exit the cruise pier. You get off at the hospital and you walk towards the sea. I would go for the walk-by-the-sea, though. On the way to the museum, you can also visit Agia Triada church - a little church on the corner of the hospital plot. It is known for the murals which were made by a famous painter (Gounaropoulos) and are quite different from the murals you see in other Orthodox churches. All in all, Volos is an easy town to visit as you can never get lost. Down is the sea and up is the mountain! Have a great time!