Let your littlest travelers go wild at Agiruno Oka. They'll sleep restfully after a few hours of climbing on and swinging off the equipment.
You'll find this outdoor play area in Nagasaki. Once you've done everything you can at Agiruno Oka, head to nearby Nagasaki Atomic Bomb Museum, Megane Bridge, and Nagasaki National Peace Memorial Hall for the Atomic Bomb Victims.