Japan is genius when it comes to implementing those simple things that kids like. Like putting little shallow water areas in playground, all kind of mechanical things and variety of playgrounds from all types dotted all over the city, some would considered to be "dangerous" in the west. There are ones where kids can even light fires and play with working tools or cook. There are theme parks all based on various playgrounds without any electricity driven rides. You can also stamp a special kids book in train stations and even places where kids can act play in various adult "jobs" like cashier or mechanic or whatever. My kids had so much fun at those places, much more than in Disney, although they enjoyed it too.