June 8 is World Oceans Day, a day to celebrate our oceans. Tons of activities happening from June 7-9. I only listed one here, but many Bay Area organizations are hosting events, including the California Academy of Sciences, Seymour Marine Center in Santa Cruz, Aquarium of the Bay in SF and more. Plus there are beach clean-ups and sand-castle building contests (East Bay Regional Parks) great for kids. See a full list here.
World Oceans Day at Marine Science Institute - this Redwood City organization is offering 2 hour bay voyages on Saturday. Sign up in advance (fee). Inside they're hosting an open house for their summer marine camp in Redwood City from 1-5.