You can only dive at low tides, this implies a reservation of at least one day before, and at the same time, our staff will inform you about the time of the tides.
You can only dive at low tides, this implies a reservation of at least one day before, and at the same time, our staff will inform you about the time of the tides.
I would use "... one day in advance ..."
"The time of the tides" is fine. You can also say "the tide times".
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