5. One of the world’s longest sea caves
Santa Cruz Island’s Painted Cave, Channel Islands National Park
At nearly 100ft wide and 1,225ft deep, Painted Cave is one of the largest sea caves in the entire world. Even better? You can kayak into it. It’s pitch black inside (you know, because it’s a cave), so turn your headlamp on to find out how it got its name. (Hint: it involves lichen and algae on the walls.) And be sure to wave to the seabirds, seals, and sea lions that will greet you as you arrive.
6. Hot springs near SF that only appear during low tide
Steep Ravine Campground, Stinson Beach
You’ll have to be okay with the possibility of crowds, hiking a trail that’s covered with poison oak and lots of slippery rocks, and a major chance of spotting some old man balls (go in expecting lots of nudity). But if you can survive all of that, and you go at the right time (extreme low tide), Steep Ravine’s hot springs are a great place to soak and relax while waves from the ocean crash on the rocks around you.