Just a slight correction, the cruise ships city tour does not include the old Mazatlan. It includes the Cathedral but not the Machado Plaza or the Angela Peralta Theatre. The walking tour is also nice, but they do not see anything else but the Old Mazatlan. When you take a tour with an independent tour guide, you see both places and more.
Hope this little correction helps. Saludos amigo!
Thank you for your answer Harry. Also thank you for all the nice reviews you have given about me to some people I have taken recently on tours here. They told me that they enjoyed very much. I hope I can continue beeing informative on this board also. Please say hello to Art also. Gracias again amigo!