Changing Winds

What if our crew could explore sand Only at falling tide same as digging for treasure on an island.
For instance if you were sailing around the island but then the tide dropped and you didn’t finish exploring that port and you really want to, you could have your crew wade thru the sand and dig trying to find crates.

They also might have some sort of injury on the bar, giving crew kits more* value

*looking in hindsight it probably won’t change a thing.