There seems to be 2 Mexican Pacific itineraries offered.
One is Acapulco, Zihuataneja & Ixtapa, and Manzanillo.
Most Mexican Pacific cruises go the Cabo San Lucas, Mazatlan, and Puerto Vallarta. I don't know which itinerary provides better history/culture and nature.
PAST TRIPS= Enchanted Capri
Carnival: Inspiration, Legend, Valor, Destiny, Holiday, Triumph, Splendor, Fantasy
HAL: Maasdam twice, Statendam, Oosterdam