Match your RCL status to Celebrity, often referred to as "X". With Elite status, if you don't already get free drinks, you get free drinks from a happy hour menu at most bars every night but the first. There may be additional gatherings for Elite. You also should get a free bag of laundry
The one thing you should know X is the main show and the dining times, for most sailings, the main show is at 7 and repeated at 9 (if in Europe, 730 and 930) and between the main show showings, a passenger participation game show. This is usually all there is for evening entertainment options, there isn't a dedicated comedy lounge, karaoke bar or piano bar. So pick your dining time accordingly