Tide pools with a four-year-old: a working checklist

Tide pools are the best natural classroom available to a kid who can't read yet. They are also extremely unforgiving if you show up at the wrong time.

Get the tide right

There is a two-hour window at low tide when the pools are accessible. Outside of it, there are no pools — just ocean. Look up a tide table for your specific beach (not the city, the beach) and plan to arrive thirty minutes before the lowest tide. Leave when the water starts coming back in, not when the kid gets bored, because the kid will not get bored.

What to wear

• Water shoes. Not flip-flops, not sneakers. Water shoes with a real sole. Barnacles will cut through anything softer.
• Pants you don't care about. Everyone is getting wet to the knees.
• A hat that stays on in wind.

What to bring

• A small plastic bucket, not a big one (they're tempted to fill it)
• A magnifying glass or cheap loupe
• A single field guide card for your region (laminated if possible)
• Drinking water — the salt air makes everyone thirstier than they expect

The one thing people get wrong

They try to find things. You don't find things at a tide pool. You sit next to one pool and wait for two minutes and the pool starts moving. The hermit crab that was invisible is now visible. The anemone opens. You always see more by sitting than by looking.

The rules we teach

"If it's stuck to a rock, it stays on the rock."

That's the whole rule. No taking anything home. Everything you pick up goes back exactly where it was. This is boring to explain once and then it's done.

When to leave

Before they're tired. Before the tide comes in. With snacks still in the bag. Leave on a high note and tide pools become something they ask to go back to. Push it and they associate them with being cold and dragged off a rock.