This was a huge community-built play park adjacent to an elementary school, and a project I took on when I was auditing Joe Frost's UT course on play in the early 80's.  You can compare the model I built with the aerial photo to get a sense of its size (you can just make out the stockpile of tires, 

some 2000 in all, that were used in the project).

The various components include a central superstructure, a boat, a ferrocement tunnel embedded in a hill, several topsy-turvy bridges, multiple wood decks, bermed sand areas, a trellis, a talk tube system, a cableglide, playhouses, earth-filled tire climbing cliffs, and multiple plantings.

The central focus of the play park was a giant painted tire tent/climber with interior and exterior decks and several large tire swings suspended from cantilevered poles radiating out from its center.