1. Old Mazatlan, also known as Centro Historico, is a charming area in Mazatlan filled with colonial architecture, narrow cobblestone streets, and historic buildings. It is a great place to explore and immerse yourself in the rich history and culture of the city. The area is home to a variety of attractions, including the iconic Angela Peralta Theater, the Plaza Machado, and the Cathedral of the Immaculate Conception.

2. The working hours of the various attractions in Old Mazatlan can vary, so it is recommended to check the specific hours of the places you plan to visit. Some attractions may also offer guided tours, which can provide valuable insights into the history of the area. If you need to contact any specific attraction, you can typically find their phone number online.

3. Most of the attractions in Old Mazatlan are free to visit, such as the Plaza Machado and the Cathedral of the Immaculate Conception. However, some attractions, like the Angela Peralta Theater, may charge a fee for entry to certain events or performances. Transportation to Old Mazatlan is convenient, with taxi services and public buses available throughout the city. It is also possible to explore the area on foot, as many of the attractions are within walking distance of each other.