Jamieson Bay Boat Ramp is a park and boat launching spot at Tindalls Beach in the Rodney area, with a Google rating of 5.0.
Coastal parks with a boat ramp are mostly about timing and preparation. Tide matters most: many ramps are only usable around high water, so check a tide table before you tow a trailer down, and watch for soft sand or weed near the bottom of the slope. Launch and load quickly, then move your vehicle and trailer out of the way so others can use the ramp. Check the marine forecast and wind direction, since a sheltered bay can turn choppy fast, and carry lifejackets for everyone aboard. Regulars tend to arrive early on fine weekends and in summer, when parking for trailers fills up. It is also worth taking rubbish home and rinsing gear where signs allow, to protect the shoreline.
For anyone heading out on the water from Tindalls Beach, Jamieson Bay Boat Ramp gives a local starting point on the Rodney coast.