My favorite playground structure was always the set of "monkey bars" at the west end of the field on my elementary school campus. I wasn't a huge fan of the metal slide to begin with, but after slicing open my index finger on one (I still have a long ugly scar, and I can't properly straighten my finger) it definitely dropped low in the rankings. The weird cage-thing climbing structure was okay, but the bars were awkwardly spaced.
The monkey bars, though -- those were good times. You could balance yourself on top, then flip forward and over, giving yourself a neat little head rush as you watched the world spin and right itself. It was so fun, it was impossible to resist the temptation to do flips even on those days when your mom made you wear a skirt (thankfully rarely), which led, inevitably, to minor incidents of public exposure. The public, being children, would of course respond with a chorus of "I see London, I see France, I can see your underpants!"
Since I'm knitting my Monkeys (am I the last person on the internets to be knitting a pair?) toe-up, the pattern is upside-down, and this of course led me to remember my days of hanging upside-down on the monkey bars, looking at the world from a different perspective. I wonder if they still allow monkey bars on the playgrounds these days -- they do seem like a good way to break a neck, and they obviously create a risk of flashing one's undies to one's classmates. On the other hand, how good can a childhood be if it doesn't include the occasional risk of public humiliation or injury?