Oceanarium and the Green Theatre on the left-hand side of the Square of Industry.
The souvenir shop and restaurant at the entrance.
Early morning, and ideally not on the weekend. It's definitely worth spending a whole day in the centre. Even in one day, it's extremely difficult see all the attractions. But it's also possible to make a quick visit if you have limited time.
Bring your ID card, cash and small change for the vending machines. Credit cards are not accepted everywhere. If you plan to rent a bicycle, scooter, balance bike, skateboard, velomobile, roller skates or winter skates, you'll need your ID.
Keep an eye on your belongings -- the place is crowded. Restaurants and cafes inside the centre are normally packed on weekends, so it can take time to get a seat. Also remember to dress comfortably, wear walking shoes, bring a bottle of water and -- most importantly -- enjoy yourself!