Dedicate your sixth day to visiting some of Florence's lesser-known museums and gardens. Start with a visit to the Museo Galileo, which houses a vast collection of scientific instruments and artifacts. Explore the Museo dell'Opera del Duomo, where you can admire original sculptures from the Duomo and the Baptistery. Take a break for lunch and enjoy some delicious gelato from one of Florence's famous gelaterias. In the afternoon, visit the Bardini Gardens, a hidden gem with stunning views of the city. Explore the Stibbert Museum, home to an extensive collection of armor and weaponry. End your day with a relaxing stroll through the Cascine Park, the largest public park in Florence.