I was a Cunard noob last summer for a crossing from Brooklyn to Southhampton. I read the threads about dress codes and theme nights ahead of time and planned accordingly. My daily dress habits pretty much meet the standards for non-formal nights. I purchased a Tuxedo for formal nights because I was planning to use it for future events. Following the theme for the theme nights was enjoyable for my GF, who enjoys dressing fashionably.
We enjoyed watching the couples dance in the Queen's room each night. The waiter remembered our order preferences and accommodated us each night. One night, we joined a line dance, not knowing the steps. The male and female dance hosts expertly paired with us and ensured we enjoyed ourselves. They had a 70s and 80s night, and then I got out on the floor and channeled my inner John Travolta (or Revolta, if you prefer). A few regulars saw me the next day and noted my performance in a smiling, friendly way.
My major faux pax was getting angry with a couple of crew members when I failed to itemize the laundry list. They returned the laundry not completed. I really should have known better. I was trying to assist GF, and some of the words on the list did not match the types of close she had, and I was lazy. I apologized profusely, and all was well.