The Jumper is in Castellón. Tap the map or the "Get directions" button to see the exact location and the route from your position.
Yes, The Jumper's official website is thejumper.es. You'll find the direct link in the "Website" section of this listing.
On this listing you can see "Other playgrounds nearby" right below, sorted by proximity. You can also open the full playgrounds in Castellón page for the complete map ranked by distance from your location.