There are some coaches in the market i believe don't know if there still there but it would be nice to have a carriage from valk to midway, then from there to the vistani camp or the village. If you want to increase the players in the port, cutting out that run would be a good way to do it.
There is the ferry to Midway. Plus...
"Most commoners in Barovia travel on foot, though the rugged terrain can make journeys arduous if one ventures off the maintained highways and roads. [...] Horsemanship is not especially practical in the mountainous regions, though it thrives in the hill country of the west" [GAZ.1, p.22]
Most travel of wares is with caravans with oxen, but there is no mention of carriages. Adding to this, western side of Barovia is Krezk, Zeidenburg, Vallaki is at the centre of the realm, Village of Barovia east, and they are mountain areas.