I want to make sure this review is as most realistic as possible. A one-star review would be a complete lie. Five stars would be way over the top. However, if there were three and a half stars, I would give just that. Without speaking any Portuguese the staff was lovely, they tried their best and were very accommodating to us. There were many animals and a lot of attractions inside. With a two-month-old child and a three old, we felt safe, without fear.
The only issue arose at the end when the exit was to a random alleyway. Being from a big city it just did not seem okay to walk out that direction with family, because no taxis were there(which we of course needed). But walking through to the entrance was not an issue. Also, a lovely lady assisted us with explaining to the taxi where we needed to go.
Overall, it was a great experience, a little pricey, but for the number of attractions WORTH IT 100% recommend. Your kids will enjoy it, it is not a huge western world aquarium, but it definitely competes with them.