This is one place you should definitely not miss if you're visiting Quebec. Try and reach around 10 to see the change of guard ceremony since it's very traditional and one of it's kind of experience. The Royal 22eme Regiment Museum is also worth a visit with its amazing display of collection of the regiment's and the Canadian history, especially through the two world wars and the Korean war. We reached just around 10 but I'd recommend reaching around 9:35-9:40 because it gets crowded by 10 and you may not get the best view (and also factoring in about five minutes from the entrance since you have to buy tickets). The ceremony had already started. They have narrators in both, French and English. It's a great watch. They have a walking guided tour of the fort. You cannot walk around the fort without an escort since the fort is still an active military base. The only option, if you don't want to take the tour is to either go to the museum or leave. Just one thing about Uber - Ubers can actually go all the way to the fort's (museum's) entrance but we had an experience where an Uber driver canceled after reaching till Cote de la Citadelle saying he can't come in.

La Citadelle de Quebec is a historical museum dedicated to the 22nd Regiment that fought in many wars. The entrance fee is 18$ for an adult and you are provided a map with all the spots to visit (you can also download an audio guide in french or english to enjoy further your visit). The Covid measures are respected on site with hand sanitizer available in the main building which includes a small closed museum with military items from several dates. The only issue with closed places is that having a mask on can become tricky and make you uncomfortable. When you get outside each spot on map (see pic) has a guide that will provide an explanation on a portion of the site and respond to questions that guests might have. The guides are enthusiastic and nice. Not all building are open due to Covid-19 but you can visit the prison. You also get to see some great views of the Saint Lawrence River. Overall - Interesting and fun visit - Recommended

Unless you are part of a paid (and pre-arranged tour) you cannot inter the confines of the Citadelle. We were happy to walk the ramparts and see the changing of the guards in full uniform. Interesting, they now allow the military here to have full beards.