As someone living in the vicinity I can especially recommend Planten & Blomen, a winding park that goes for 6 km nearly all the way down to the river Elbe. Also has a small japanese garden.
At new years eve though?
You can do ice skating at Planten un Blomen!
"small japanese garden" - I think its the biggest one in europe still if I remember right
Yeah the gardens arent that useful because its insanly false.
Pardon? I walked to CCH from my hotel every day, a nice 15-20 minute walk. I would go through the gardens more often than up near the train station. I also noticed that German businesses/buildings tend to really crank the heat, so oftentimes during the conference I would need to step outside to cool off. The outdoor area just outside with all the curved/arched metal structures was a nice place to stop and enjoy a cup of coffee, looking out at the big antenna building in the distance. I think the gardens are great! I would see the Airbus beluga planes coming in for landing which was really cool to witness as well. The botanical building had been closed for the year, which was a bummer, but all the surrounding areas were really quite nice to explore. Huge tall oak trees, lots of foliage, everything was covered in a wet moss. I loved it.
I think I wanted to say its insanely 'cold'.
So in the Summer the Garden is useful, but during the congress very few people spend much time outside.