Some beautiful buildings, many cafe shops and restaurants but their menu are similar, of course many gift shops, I think you can spend there for around three hours is enough.
Venders won't leave you alone but at the same time they are very sweet. If you are firm with them they will stop. The plaza it's self is very pretty and historical plus the local color is very beautiful.
Probably the most happening place in Puno. Historic city center with numerous restaurants in the vicinity. Peru tourism office is conveniently located nearby.
We were lucky to have seen a military procession while exploring Puno. This is a nice picturesque plaza.