Illa Fantasia is a water park located just outside Barcelona ( about 25 by car ). It should be a "must visit" point among your Barcelona activities.
The park is open during the summer months and is one of the most popular destinations for the whole family. The water park covers more than 20 different attractions and there are also three large swimming pools. The 75000 square meter area also holds good opportunities for visitors to have a little picnic during their visit.
There are large recreational areas and more than 800 tables where you can eat your packed food. It's fine to bring your own food into the park, but there is also a possibility to buy food on site, as well as barbecues for those who want to grill their food. It is worth to mention that it is possible to reach park by train ( from Barcelona's downtown ).