These sculptures are beautiful works of art, and they are fun for children to play on. Furthermore, the signs near each one describing their history are quite interesting to read. I encourage you to read the signs in addition to hunting for the cache.
These sculptures were created by Benjamin Dominguez in 1960. They are listed on the California Register of Historical Resources. In 2015, they were restored and given a paint job and they look great now.
Enjoy the rest of the park. It is great for walking, jogging, bicycle riding, picnicking, fishing, duck/goose watching, and even watching people play with remote control boats.
The cache is not on the play structure or even inside the sandy area surrounding the play structure. So, there is no need to enter the sandy area or frighten children or parents to find the cache. On the other hand, if you want to play on the structure, that is great fun and encouraged. Feel free to post a picture with the sculpture.
There is also a Army Corps of Engineers facility near this cache. Obviously, do not jump the fence. Stay out of it. The cache is not past the fence or even on it.
Watch out for spiders here. I strongly advise bringing gloves for this one.
Be careful that you are not seen by muggles. They love this park too.