To walk along Marin's Muir Beach at low tide is to visit a virtual sea star sanctuary. Stroll north, cross the gently flowing Redwood Creek (it's shallowest and easiest to cross closest to the ocean), and start rock-hopping, betting on who can spot the most colorful treasures. Some rocks, like those nearest to the ocean, burst with dozens of sea stars. Watch your step and navigate around the hundreds of sea anemones that reside here as well. After getting starry eyed over sea stars, head just past the rocks for another low-tide-only locale: a sheltered sandy cove, perfect for kicking back and watching the waves. San Francisco's Sutro Tower is visible in the distance—but city life feels far away.

Low tides: March 15, 1:33 p.m. (-.2), March 16, 2:38 p.m. (-.3). The best time to explore is a negative low tide. For information on more upcoming low tides, click here. As with every low-tide exploration, keep an eye toward the ocean for rogue waves. Muir Beach closes at sunset. For directions and more information on Muir Beach, click here. Dog-friendly!