Princess Cruises' Sapphire Princess and Star Princess will operate Mexican Riviera cruises departing from Los Angeles and San Francisco, respectively, for the 2008-2009 season, the cruise line announced Monday. Sapphire Princess will operate seven-day voyages from the Port of Los Angeles calling on Puerto Vallarta, Mazatlan and Cabo San Lucas between September 27 and May 2, while Star Princess will sail a more in-depth 10-day itinerary featuring calls in Acapulco. Early booking fares begin at $599 per person. Visit [www.princess.com].