A short 3-day cruise is a great getaway. These quick cruises are available from LA all year. They are affordable and lots of fun.
3-night cruises from Los Angeles go to Ensenada or Vancouver. Ensenada is at the northern end of the Baja Peninsula, a short trip from California. Activities include shopping for silver and pottery, kayaking, horseback rides, and sunning on the beach.
For a different kind of short trip, try a 3-day cruise from Fort Lauderdale Florida.