There is more to the beach than crabs. When I was a kid there was something to do at the beach regardless of time or tide level, and that has apparently not changed.
There are sticks, for example, which can be weapons, or tools, or… well, to be honest, mostly those two. Maybe mostly weapons. A weathered board laid against a washed-up mass of tree roots makes a springy ramp for walking and jumping. Logs are worn away so that the stumps of their branches stick out extra far, and they turn and shift under your feet. I watch my children play with their balance and reaction times.
And there are endless Things To Find. Bits of shell; interesting rocks; smooth driftwood. Rubbery seaweed with tough, fluid-filled pouches. Thousands of baby snails. Sand fleas. And more and more and more, so much that a two-year-old (or, if I’m feeling like I’m on vacation, I) can poke around in mud and sift through sand for hours.