Quick drying and a wicking type of material that draws the moisture from your skin if you are prone to sweat, runners use this type of material, and it's available at many outdoor and sports stores. Also, the quick dry feature allows you to rinse it out in the sink, hang dry, and have it ready for the next days travel. Another suggestion is the Tilley line of clothing, designed for the type of travel you are planning, and they have an LA location at:
11161 W Pico Blvd.,Los Angeles, 90064, (310) 473-4574 If they are convenient I would check out their travel clothing.
Have a great vacation.
Edited: 2:31 pm, July 07, 2012