Well the first thing might be to try and group the things on your list based on proximity to each other.
a few comment son the items on your list:
Tivoli will certainly satisfy everyone's inner child. Aim for afternoon evenings. There is a fireworks show every Saturday evening.
Strøget is really just a pedestrian shopping street that runs through the inner city. In itself nothing special, but it's a nice way to get trough the city.
Højbro Plads is on Strøget.
Strøget ends on Kongens Nytorv square, where you will find Nyhavn on the other side. Nyhavn is very scenic (it's on every other postcard of Copenhagen), but also a bit touristy.
While in the general area you should also check out Rundetårn (the round Tower). There is a spiral walkway all the way to the top and nice views. Also have a look at Kongens Have (Kings Garden) and Rosenborg Castle.
Christiania is well worth a visit. i can highly recommend one of the guided tours run by the local residents: https://www.rundvisergruppen.dk/indexENG.htm
Nearby is Vor Frelser Kirke. The walk up the exterior spiral stairway is very fun.
Also have a stroll along the Amsterdam inspired canals of Christianshavn while you are there.
Marmorkirken and Alexander Nevsky kirken are right next to each other and also just next to the royal palace Amalienborg, so go there and check out the royal guards.
You could also walk down to the old naval quaters of Nyboder.
Glyptoteket is great and worth a visit.
Nearby across the bridge is islands Brygge, which is really just a residential neighbourhood. The only reason to visit in my opinion is the harbour baths there.
As Jason says, Kastrup sea baths is close to the Aquarium, but it's way out by the airport. so unless you do both, i would skip the baths and just go to the ones in Islands Brygge.
CopenHot I had to google, it looks super nice, so I will have to go there sometime.
Assistens Kirkegård (spelled without the e. The philosopher Søren Kierkegaard spelled with an e is buried there though) is nice for a stroll and finding famous peoples graves.
Frederiksborg Castle is a day trip out to Hillerød. For a full day you could combine it with Helsingør and Kronborg Castle (the one from Hamlet). look at train schedules etc on www.rejseplanen.dk. The Copenhagen Card could be worth it here, since public transport is included.
If you take the ferry to Oslo, you will also sail by Kronborg Castle. it's a really nice view.