If I can give the OP some advice, always state what ship you will be on so posters can accordingly tailor their responses. We seldom get off the ship. There’s plenty of things to do on most ships and although some venues are closed until later in the day, including the casino and shops there’s enough things open to satisfy any food and booze cravings you may have. Although the MDRs are closed, the Local, buffet and the snack buffet in the Observation Lounge are open for breakfast and lunch. Many people enjoy watching movies on the big screen in the atrium and it might be the only time you can secure a nice lounger on the pool deck. It’s also nice exploring the ship without having to deal with crowds. We actually look forward to port days to simply relax in an uncrowded environment.