I dare you to find a cooler father than Steve Kuhl, who built this pirate ship bedroom for his six year old son. If this doesn't add value to their Minnesota house, nothing will. Not even a gold-plated Jacuzzi.
With a rope bridge connecting the floating pirate ship with a jail cell, and a rope that drops into the closet, that would already be enough of a playground for any active six year old. But Kuhl went one step further, and actually installed a spiral slide that spans two floors of the house, as you can see in this photo:
The slide propels the slidee into a closet, which pops open and displays its hidden secret. Quite a surprise for any guest who thinks that's where the extra towels (or pirate loot) are hidden! [Kuhl via Curbed via DailyWhat via MyModernMet via The Best Part via Dudecraft]