Adjust as needed depending on the activities you plan for your trip. Pack a range of casual separates that you can mix and match. Take more tops than bottoms. Stick to neutral shades for pants and skirts. Black is the easiest, but you can also choose navy, gray, brown or tan.
Tops can be more colorful.
Wear the suit to nice restaurants, the theater or other dressy events. Use the blazer on its own as outerwear, or layer it under a coat if the weather's cold. Pack one dressy blouse or shell that goes with the suit. Leave the gym shoes at home unless you plan to jog in them. Accessories are a good way to give your clothes a different look, but don't pack them if you won't wear them.