Carnival Splendor docked in Mazatlan at 9 am and left at 6 pm. This gave us pretty much the full day in the Mexican city. We enjoyed walking along the boardwalk (the Olas Altas Promenade) and exploring the Historic Center (Centro Historico) with the highlight there being the Cathedral. The people were friendly. The vendors were persistent yet polite. We had a great time and spent less than $10 for the entire day (and that $10 was spent on a trip to Stone Island, tips, and we bought a bottle of water). It was truly a frugal stop.