"The thing I do to make my 3 cats happy: a mini roller coaster...

... turning a long flight of stairs into a multi-cat slide ending in pillows and blankets.” 
Yep, a real cat lover building an elaborate DIY staircase roller coaster using taped cardboard barriers, with cats riding down in plastic bins, boxes, and laundry baskets for entertainment.
And kitties enjoy their new roller coaster! 😻😻😻