From ninja playgrounds and roller slides to grassy sledding hills and space-themed nets, Wanpaku Land in Odawara is a massive (and free!) family adventure spot that’s anything but ordinary.

From pony rides and paddle boats to petting zoos and play streams, Kodomo no Kuni in Kanagawa is an expansive kids’ wonderland that can’t be done in a single day—but we’re giving it our best shot!