Yes we did Alaska in May of '08 and Sept we did Caribbean out of Galveston on the Conquest. That has been my favorite so far.
Manzanillo excursion was book thru Carnival. It was a great day, lots of country scenery and a tour of the ruins. From there they took us to a small villiage for lunch and shopping. Really is not much in Manzanillo as Rev 22:17 said, it is very industrial.. you have to get away from the city.
We have done Catalina, Ensenada on the Ecstasy. The Baja cruise is done only 2 times a year. Cabo, La Paz and Esenada on the Elation.
When in October are you sailing?