Need some tips on Italy!

In Florence, you must see the David at the Acadamia and eat at il Latini. They feed you until you literally can eat no more. Eat prosciutto and gelato often, but not together. Take the trains to look at the scenery and watch the people. Whatever you plan on spending, add another 50%. If you are close to the beach, go and lay out and drink wine all day long at least one full day.