It seems like no matter where you go around here in the summer, you're going to find blackberries. In this location, you get your pick: The native variety, dewberry or Pacific blackberries, the ones with the bluish stems that trail low to the ground, with oval leaves in groups of three. These also tend to be the tastiest! Then there is the invading evergreen or cutleaf blackberry that grows upward and spreads like crazy into thickets, with leaves in groups of five that look vaguely like maple or cannabis leaves. Then there is the truly obnoxious invader, Himalayan blackberries, the ones every geocacher is familiar with, because they grow high and huge and EVERYWHERE! If you find this cache during the later summer when the berries are ripe, try all three and see what you think (but, seriously, the native berries are the best!)
Fourth of July (sort of trivia): One of the options that many people used after the Boston Tea Party (when tea was scarce or unavailable) was steeping raspberry or blackberry leaves for tea.
There is a large pullout with plenty of room for several cars, but the traffic can be busy out here, so be careful!