Many people mistake Ecomare for just another aqua zoo and some are disappointed when they compare it to other aqua zoos in the world. Be aware that Ecomare is first of all a seal and bird sanctuary. Furthermore it is a nature museum, a sea aquarium and it houses the visitor center of the National Park "Dunes of Texel". The outdoor basins have recently all been renewed and they now give you a better and closer view of the seals.
When you are in Texel be sure to visit Ecomare, it's a great way to learn a lot about the North and the Wadden Sea.
The website of Ecomare is mostly in Dutch, even if you click on the British flag in the top right corner.