If you live in the area or are simply visiting Castelldefels with your kids, here are some great tips about what to do and where to go:
Biblioteca de la Playa Carme Romani
The main library in town is great and has interesting workshops for adults and kids. This beach location of the library is only open July and August afternoons. Its right by the beach in a shaded park area with sea breeze and tables outside. You can check books out and also board games/toys. They organize some weekly craft events/book readings at the library beach location.
Beach library: https://www.castelldefels.org/es/equipaments2_tel.asp?idGuia=31589
Main library: http://www.bibliotecarfjcastelldefels.org
Parc de La Granota
Very shaded and high up behind the Castell of Castelldefels, perfect in summer. You have to park and walk into a fenced-in area, there are many levels of this park and even a small pond. Two great playgrounds. You aren’t on the street so the kids can run wild. There is also a little water spout so beware take a change of clothes. Look at photos. It is hard to describe.
https://www.castelldefels.org/es/equipaments.asp?idGuia=31657
Mar de pins
This is technically in Gava. Great outside play space for kids. There is a Cafe/Restaurant for parents. Enclosed so parents can relax. Shaded forest so ideal for summer. Bounce house, also a small ropes course. Just be careful you aren’t there the same time as a few birthday parties, it can get very full in the afternoons.
Canal Olimpic de Catalunya
This is a good place to go with bikes, scooters and strollers. There is a track that runs around the canal. You can also go without a membership and just rent kayaks,paddle boards, canoes, etc. There is a wake cable park. By the wake cable park there is a chill out area with a park and a trampoline built into the ground for the kids.
La Casa de La Iaia
In town a kind of “ludoteca”, I wouldn’t really recommend it to go play on a day with great weather outside, but they do cool crafts/workshops for the kids.
Safari park
In town by Mercadona. Also like La Casa de La Iaia, I check their website occasionally for talleres as they do some nice things!
Jungla Park
There are two Jungla Park locations: one is outdoors and only open during summer months on the north part of Castelldefels bordering Gava. It has bounce houses with a sitting area for the parents. Very shaded and with canopies.
Address: Passeig de la Tramuntana, 1, 08860 Castelldefels, Barcelona
The indoor Jungle Park is in Gava: C/ Oficios, 1 (08850) Gavá (Barcelona)