If you love being out by the ocean at night and want something unique for the whole family, definitely sign up for a grunion run experience with the Birch Aquarium. It's especially awesome for kids.
Grunion are silver fish about 4 or 5 inches long and only found off the coast of California. Every year around springtime, they come on the beach to spawn.
I recommend signing up with the Birch Aquarium where scientists give a short lecture about grunion, as well as how to find them, and the laws about viewing.
The grunion run about an hour after the high springtide has begun, so the folks at the aquarium kept us occupied with info about how they got their name and their place in pop culture- yes, you'd be surprised.
After the discussion and short video, they passed out small vials with a bit of sand and ocean water to each family and/or group. We lightly shook the vial and then got to watch eggs pop up from the sand and hatch!
After the informational talks and hatching, the group walks out to the beach to wait for the scout fish to come and check the beach out. If everything's all clear, they wiggle back to the ocean to give the okay and then the "party" begins!