Lonely Planet has rated Copenhagen the top city to visit in 2019! Congrats Copenhagen! I must admit you are one of my favorites in Europe too. People are happy and relaxed, beautiful buildings, good food and drinks, easy to get around the city, lots of design, and lots of bikes...
Tour company Colette Tours has a great 14-night escorted tour which includes Copenhagen It's called the Norwegian Coastal Voyage & Scandinavian Capitals tour.
Tauck World Discovery also has a 14-day escorted tour which includes Copenhagen.
If you want me to book you on an escorted tour that visits all the highlights of Scandinavia for 2019, just send me an email at firstname.lastname@example.org.