Oakland’s Morcom Amphitheatre of Roses is a Hidden Gem
I lived about a half mile from this beautiful gem before I learned about it. It is definitely worth a visit.
Last year, when they put out a call for volunteers to “deadhead” the roses, there was some confusion when a bunch of aging hippies in tie-dyes showed up. Hilarity and gardening ensued, as reported in the SF Chronicle.

There is a group called the Friends of the Morcom Rose Garden whose dedicated volunteers help keep the garden beautiful.