Tuscany for Art and Architecture
The guide book I got listed several cities outside of Florence (but very near) that might be worth looking into. The list included -- Lucca, Pisa, San Gimignano, Siena, Pienza, Montepulciano, Lucignanao, Arezzo, and Sansepolcro.
Based on advice from Edwin I remember him saying that we should not worry with going and seeing Pisa --
Lucca is described as being a great city for architecture buffs -- and there is one building that i was interested in seeing in the city --- Cattedrale di San Martino (image) -- link to description of building --
This town looks pretty great and I'd be interested in checking it out, but more interestingly than this town would be Siena.
Siena seems to be second only to Florence for art and architecture to see --
a couple of Museums it recommends are Museo dell'Opera Metropolitina and Museo Civico
other attractions to look into -- Piazza del Campo (looks like a great place to wander around and maybe have lunch)
I know Florence is going to offer a lot to see but look into Siena and see if there it peaks your interest -- it did mine.
good link to info about Siena -- http://www.sienaitaly.com/pages/home.html