You will get loads of food, for a fixed, low price. So make sure you shop around before you sit down to dinner. Picnics are a great way to get to know the city and feed yourself in one, fell swoop. Okay, okay, munching bread and cheese and sipping wine on grass gets a little old after a while. Believe it or not, you can go out like a civilized person with money to spare if you plan ahead.
Museums often offer reduced admission to visitors who arrive in the late afternoon.
To take advantage of this, check with the city's tourism office. They should be able to tell you which museums offer this service. Most nightclubs and bars charge a cover as the night progresses. But you can sidestep this fee by arriving early, when bouncers haven't yet begun charging. Cafes are another form of cheap entertainment because you can bring your book or laptop and stay all day, provided you buy at least one drink during your stay.