Hi mate,

Flat point is fairly accessible there is a relatively long shingle beach that runs along alot of the coast. If you turn right at the river mouth you can get right down (4x4 would be handy though). If you go all the way to the end you can park up at a little parking spot in the subdivision and there is a walkway which will take you all the way down to the beach.

White rock you have a few options, once you get along the coast there will be three gates next to each other you can take the middle one and drive down a track until you get to a little parking area here you can walk down to the river,there is a long shingle beach that runs along the coast. Alternatively you can just keep driving south and there are accessible spots all along until you get to the padlocked gate.

Whareama Beach- Unless you plan on hiking over from Castlepoint im pretty sure the main access point would be from the river. Between Whareama and Castlepoint there are some nice beaches that are more easily accessed like Otahome so that could be an option for you!

Te Waiti/Tora also has a few beaches you could fish. Once you get down to the water front the road will spike left and right if you head right towards Tora there are several shingly bays which can offer great fishing!

Hope this helps.