Castlecliff Beach Freedom Camping is a freedom camping site at 40 Karaka Street, Castlecliff, Whanganui 4501, rated 4.1 from 7 Google reviews. Reviewers like the space, the seaside setting and the quiet nights, and say the toilets nearby are clean. One reviewer had a rough night in very strong winds, and another found the phone signal weak.
A good freedom camping spot is judged first on how well it copes with wind, since a van can rock badly in strong gusts. Basic facilities such as toilets, rubbish bins and water count for more than views once the night is set. Check local rules on where vehicles may park overnight and whether there are time limits before you arrive. Regulars often arrive early to get a spot near the facilities and to avoid the evening rush.
For a seaside night in Castlecliff, this site is worth a look when the forecast is calm.