Wear something Lime green, ribbon in your hair, or on your tote. You can make a tag from the paint sample from Home Depot. There is a line from Disney that the paint chips are Mickey shaped. Cut them out carefully and hang them from your tote or suitcase like a luggage tag. People will recognize you as a DISer.
I believe you can purchase some hats, visors, etc from DIS.
Post your cruise dates on the cruise meet forum and check out others that are cruising with you. Maybe you can set up a time/date to get together for drinks.
Have fun