An aquarium is arguably not sustainable, but could also be seen as helping the preservation of species and some aquariums fund conservation efforts. I also think that creating a general interest in wild-life and aquatic animals is beneficial for us and the environment.
So with that said, Laura and I went to Blue Planet this past weekend and it was great. It’s located out by the airport and is a quick walk from the Kastrup stop on the Metro. It cost 160 DKK each and there was no student discount unless you are a veterinarian student or a biology student.
The aquarium is brand new, having just opened in March 2013. It features aquariums with fish from different continents and a HUGE tank with everything from Hammer-head sharks to stingrays. I recommend visiting this place if you have 160 DKK and a day to spend.
Everyday they have scheduled feedings of the fish, usually with a small presentation of the aquarium and the different species they have. As you can see, they are popular events. 
