Air balloon!
I was considering boat, but there might not be lakes, and werewolfs can swim! But they sure cant fly, and probably can't operate air balloons.
So I'd go for air balloons. If there's simple gun powder weapons around then I'm sure someone would have invented at least a crude and simple flying device for this kind of situation. It would only really need to be flying for a night, and if you bring a friend then you could take shifts making sure it stayed floating.
The downside
A) Needs gas
B) unless you're an actual pilot who intends to steer the balloon all night, you need to tether it to the ground so you doesn't fly away. Unless you would want it for a traveling reason, it would make sense to just have it tied to your house roof or in the garden.
Which means thatC) a smart and strong werewolf would know to just pull your ship down with the rope/chain, or even climb up the rope. Or be a d*ck and cut the rope and then follow your balloon on foot until it crashed (if the balloon is not steerable/no pilot) at the end of the night