There are easy ways, and there are hard ways to get to this cache. The shortest way, is by far not the easiest.
Park in lot. To reach cache, you'll have a much easier time if you start on the trail to the north of the park near the rock wall leading to the hangmans tree.
Take low road, then high road. No need for arduous climbing. Can keep feet on trail
This is a local landmark enjoyed for generations, with a gorgeous view of the city and beyond. The dinosaurs were designed by Emmet Sullivan, and dedicated on May 22, 1936,
Dinosaurs represented in the park include Apatosaurus (formerly colloquially known as BRONTOSAURUS), Tyrannosaurus rex, Triceratops, Stegosaurus, and an Edmontosaurus annectens (formerly Anatotitan which itself was formerly Trachodon). A Protoceratops and a Dimetrodon (Dimetrodon is not actually a dinosaur, but rather a synapsid, and more closely related to mammals than reptiles) were added later on and are located near the gift shop and parking lot. With the exception of the Protoceratops, the dinosaurs they selected were based on fossils found in South Dakota and the Western United States.
The dinosaurs were constructed out of 2 inch (5.08 centimeters) black iron pipe, with a wire mesh frame and a concrete skin. Originally they were gray in color, but by the 1950s the statues were painted bright green with white undersides. Being constructed in the 1930s, the dinosaurs reflect the thinking of the times (for example, dragging tails). The tyrannosaur's original finger claws (of which it incorrectly had three on each hand) as well as its teeth have been lost or damaged over the years to where its hands are stumps and its teeth are all but gone. Vintage postcards of the T. rex do in fact show these were originally part of the sculpture. The Stegosaurus also had a shorter tail with 4 correct tail spikes, but this has changed recently where the tail spikes have been removed (perhaps due to safety concerns) and the tail considerably lengthened.
The Apatosaurus (the Bronto) is 80 ft long and 28 ft high.
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The cache is a small plastic container along one of the hiking paths on the west side of the hill to the north west of the Apatosaurus. The park is a busy place; I found a spot on the trail in an out of the way location to make it easier to avoid muggles. It has room to trade trinkets, and a log to sign. Bring your own writing implement.