@Puffinshop I’m glad the list was helpful.
i was in a bit of a rush so just a few things to add to it.
Reffen - I highly recommend Reffen. If you google it or look on Instagram you’ll get a good feel for the place. It has a really relaxed, beachy feel and it’s a great place to relax and try some really nice food and drink. It’s temporary so only opens during the summer but it’s well worth a visit. There’s a scooter ramp for children and it has a nice family atmosphere. You can cycle there (it’s at Refshaleon on Google maps) so if you do go to Christiana then you could cycle from there. Alternatively you can get the water boat from all of the ports - Nyhavn, Little Mermaid etc.
Also, just behind Reffen is a climbing and paintball centre that might be of interest.
The ski slope is called Copenhill - it’s within walking/cycling distance from Reffen. I think they do events and tubing over the summer so might be worth checking their calendar to see what’s on.
The Go Boats/swimming - the boats are a really cool alternative to a typical boat tour. You can cycle over the bridge just past Tivoli to get there. We take a picnic onboard and go through the various canals. The pick up point is a busy open water swimming area (Islands Brygge) Not sure if you like swimming but if you do this is a really nice area to swim. There’s another open swim area in Nordhavn which is nice too.
Amager beach - easy to cycle to or get the metro. Large beach area with plenty of places to relax. The pizza place I recommend is called Pomodoro D’oro. The pizzas take a while but they are worth it!
Aquarium - sorry if i came across too negative on this. It’s a nice aquarium - a few areas where you can touch fish/hold crabs, lots of sea life to look at, an outdoor play area/sand pit, and an indoor jungle. It’s nice, but after a couple of hours you’re done and there’s not a lot else to do in the surrounding area. If the above sounds like the things your kids would enjoy though, it’s definitely worth going.
Personally, and especially in summer, I would go to the zoo. I think you can spend the day there, and there’s also a new viewing tower so you can see Copenhagen from the sky. It’s next to Fredericksberg Palace and Gardens. In the Gardens you can go on a boat, sit and take in the sun. Fredericksberg is also a really, really cool neighbourhood so it’s worth going just to cycle through Fredericksberg and grab a coffee.
Train tour - during the summer there’s a mini train tour that goes around the centre. I think you can book it on via tours - it’s quite cheap and might be helpful if your children are tired.
Also, not sure when in summer you are coming but the city really comes alive during summer so worth seeing if there are any events on. We went to the Jazz festival, European diving championships and street dancing competition last year which were all good. Red Bull run a lot of events so worth checking on their calendar but also things like eventbrite. The jazz festival was a personal favourite of mine
If you’re staying near the Round tower a few other suggestions:
The boating lake at Peblinge So - nice pedal boats that fit a family of four and there’s an ice cream parlour called Isoteket nearby. Best ice cream in Copenhagen for sure.
If you’re visiting Rosenborg Castle/the Kings Garden then the Herkules Parlour is a nice place to sit and people watch in the summer. They do simple lunches too.
Just behind this is the Botanical Garden - a really nice place to walk around in the sun (I think a few people have mentioned this). This is also where the main art gallery is if that’s your thing.
Nyhavn - I’m sure you’ve been here before but just to say there’s a nice cafe in the design museum which is a little more hidden and less touristy/busy. I think it’s called Apollo.
Kastellet - not far from the Round Tower and a nice place to walk around. It’s just in-front of the little mermaid there are some nice seafood restaurants around this area. There’s also Frederick’s church which is nearby - worth popping in to see this amazing building.
Changing of the Guard - starts at Rosenborg Castle at 11:30am and ends at Amalienborg where there’s a mini display. You can walk to Frederick’s Church and then Kastellet from here.
Trampoline centre - if you have a rainy day then there’s a huge trampoline centre in Nordhavn worth checking out. It’s called Airtrix.
La Glacé - already mentioned this but if you’re staying in the area then it’s definitely worth a try.
In terms of the bikes - I totally agree that Copenhagen is best explored by bike/on foot. Especially during the summer.
The cargo bikes do take some getting used to. I know a few people that have turned over on corners as they are particularly hard to steer/balance on a bend. That said, I’m sure the rental company will give you some pointers and if you can get a hybrid one then I found this easier to manage. I also watched a few YouTube videos :-)
I think if you ride with a trailer currently then you’ll be okay with the weight, especially if you can get a hybrid one. You will no doubt clock up plenty of miles on your holiday but if you bike often then I think you’ll be okay.
It’s really flat here - I think the only inclines you will experience will be going over the bridges to get to Christiana etc.