Couldn't say; I haven't been there. (If you see videos more recent than that one, since H4K became sort-of-famous, he actually outfitted his playground with all sorts of interesting stuff that wasn't originally there.)
But a pull up bar (or a swing set) and parallel bars (or any two parallel objects you can hold onto) are enough to do a variety of interesting exercises. (BTW, I assume you know that if you take the Iron Gym you already have and put it on the floor, you can actually use it to do triceps dips as well.)
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.