There are a number of excellent tidal lagoons along the Abel Tasman coastline (e.g. Torrent Bay Lagoon, Frenchman's Bay Lagoon, Falls River, Bark Bay, Awaroa Inlet). Generally these can be explored by sea kayak 2 hours either side of high tide. There is insufficient water to kayak in the lagoons outside these times.
If walking the coastal track, you will need to time your walk with the tidal crossings.
Do not attempt to cross the tidal estuaries at high tide! The tides rise and fall twice a day and need to be considered with regards to the scheduling of your walk or sea kayak trip. Once you have decided when you will be in the park, work out the high and low tide times. (See below). There are two places that you can only cross around low tide: Awaroa Estuary, and Onetahuti river mouth. Torrent Bay Estuary and Bark Bay Estuary have an alternative high tide route, but these are longer and slower than the low tide crossing routes. The exact timing of your window for crossing will depend on which place, phase of the moon, weather conditions and how tall you are!
- 2 hours either side of low tide is fine for Awaroa Estuary,
- 4 hours either side of low tide for Onetahuti
and just take the high tide route around the others if it looks too deep. The 2 hour rule offers the best margin of safety and comfort.
To determine tide times for a given date, use
this site. You will need to select the tide times for Nelson, and subtract 20 minutes from all readings to gain an accurate time for the Abel Tasman National Park.