The old town is gorgeous, so many beauty buildings to see, lovely quirky streets and shops/cafes. If you are in Vannes on a Wednesday or a Saturday be sure to visit the outdoor market, it is an assault on the senses!
This is free just to be there. Take lots of photos and enjoy the wonderful shops all around. When we visited, there was a large public market there and the surrounding area. The food was amazing!!! Oddly enough, the public market "closed" by the time we got back there around 2pm--like it never existed. This was during the weekday so...
This is a very pretty square, where you feel in medieval times. AQs a matter of fact for their independence day, on July 14th, there is a medieval festival, and in this plaza there are representations of small sketches, everybody dressed in medievl costumes, music of that time, very pretty and nice ambiance.