The giant slide was the main draw - 102 feet long, it runs from the 4th floor to the 2nd. It was exhilarating and I screamed the entire 4 seconds it took to travel through it!
Then we picked up special "goggles" that turned our view completely upside down. Höller's exhibit is pretty sparse and nothing seemed that interesting inverted (life-sized mushrooms? seriously?) - until we got up to the Sky Room on the 7th floor.
Any view of the city skyline makes my knees go weak and this was no exception. Through the goggles, I couldn't decide whether I was trippy or just plain vertiginous!
The panoramic view is probably the best thing about the museum - though I suggest waiting till the current exhibit wraps up before paying a visit. In the meantime, you could head to the nearest playground if you are keen on riding a slide.