This cache is by the shores of Lake Merrit (a National Historic Landmark since 1963) and near Children's Fairyland (which is said to have served as inspisration for Walt Disney in the creation of Disneyland).
Your looking for a small, sturdy glass jar with a log book a a little space for smallish trinkets.
It was placed on 1/1/2020 – the first day of a new decade, may it smile upon you!