You'll need several days to cover all the stuff to do in Valladolid. It's a city that has a somewhat extraordinary architectural and cultural heritage and it's almost impossible see all the attractions in Valladolid. You can start with Major Bridge and traversing the streets of the old Jewish quarter to the Palace of the Counts of Benavente, in the Plaza de la Trinidad, and then continue to the Plaza de San Pablo, one of the most important places to visit in Valladolid. On the opposite side of this square is the Royal Palace, one of the important things to see in Valladolid since it's the former residence of the Spanish monarchs Carlos I, Felipe II and Felipe III, plus Napoleon Bonaparte during the War of Independence. In the surrounding area you'll find many palaces, churches, squares and more Valladolid attractions. You should really make a list of what to do in Valladolid before leaving that includes most of the city's monuments and everything you want to see in the city. So with map in hand you can go directly to the places that most appeal to you. The amount of Valladolid activities is so numerous that seeing everything is almost impossible. It's best to wear good walking shoes and be eager for all the things to do in Valladolid!