There is no direct traffic from the city center to the zoo island. If you want to take the subway, you can take the green line to Slussen from T-central station, then the purple line to Ostervik, and you can reach the zoo island. The traffic on the island can also take the 7-way tram to the scenic spots. In fact, it is from the city center to the old city, and then from the old city to the zoo island. This is really Stockholm people's backyard, fresh air, beautiful environment, sparse population, is a good place for their leisure.