There is SO MUCH to do on sea days. You can enjoy the spa activities, play all the sports available, enjoy the gym, shop, explore the ship, attend all the day's activities such as port lectures, demonstrations, art auctions, etc. There are always fun things happening around the pool. It is virtually impossible to experience all there is to do while onboard.
Mary Lou Scanlon
NCL Pride of America April 24, 2010
NCL Epic February 12, 2011
RCCL Allure of the Seas - September 18, 2011
Celebrity Eclipse - February 11, 2012:
RCCL Navigator OTS - February 9, 2013
Laura - you have gotten some bad information or are relying on an old myth. Depending upon what ship you are on there is so much to do on sea days, each ship has different activities. Everything from surfing to art auctions. You really can't generalize. You can be as active or as sedentary as you CHOOSE! that's one great thing about cruising.
Song of America Dec '90
Starship Majestic May '89
Sovereign X 5
Majesty Jul '01
Enchantment X 4
Regal Empress Dec '02
Mariner May '07 April '08
Grandeur Feb '08
Inspiration Oct '08
Radiance of the Seas Oct '10
There will be plenty to do on those ships. Since it's NCL's Freestyle Cruising, though, you may want to save yourself waiting times later in teh cruise and book most of your dinner reservations early on during the cruise.