We took the overnight ferry from Oslo, Norway to Copenhagen, Denmark. On-boarding and off-boarding were easy, and the ship sailed right on time! The dinner buffet was very nice, though pricey (non-alcoholic beverages were not included). Every type of meat and fish and carb was available, plus an assortment of vegetables and a large number of desserts. Breakfast was also nice.
There is much more of Denmark to see than Copenhagen and Helsingor. For those who like to shop, there are plenty of opportunities in both places, and I'm sure elsewhere. Good seafood, and healthy choices of meals in addition to desserts and bagels!