Click on Mexico Baja California - 4 nights from San Diego to Ensenada.

Ports of Call: San Diego, California; Catalina Island, California; Ensenada, Mexico; San Diego, California

2009 Departure Date(s): Feb 15,  22;  Mar 15,  22,  29;  Apr 5

Also book by 2/5 get $50 onboard credit and enjoy free stateroom upgrades. After going on a cruise last year, trust me you want the Stateroom upgrades.