and the wildflowers are kicking ass! I counted over 50 species that I recognized by name, and some more I did not. This isn't a backpacking park, of course, but there are a number of excellent dayhikes. The best ones for wildflowers that I hiked were the North Wilderness, Balconies, and High Peaks trails.
In general, for those interested, I would say that the California Coastal Ranges from San Francisco south are really hitting their peak right now for wildflowers. For backpacking, try Henry Coe State Park, Pt Reyes, or the Ventana and Silver Peak Wilderness.