We stayed one night on our way back down the coast and it was well worth it. Having stayed in areas around Seal Rocks, this was our first stay at Seal Rocks and we'll be back!
The beach has some (limited) trees and shade which is missing from the other beaches in the area and it's a easy drive to other beaches in the area.
The holiday park is right on the beach and is small enough that even the cabins at the very back are close to the beach. The staff very friendly, very helpful.
The cabin was spotless and in good condition with everything you could want, linen, kitchen equipment etc. The rooms in the cabin very small, but then it is a holiday park! The shower is small but the water pressure excellent.
The nearby lighthouse is definitely worth a visit, as are the other beaches nearby. I also recommend the tallest tree in NSW on your way in/out of Seal Rocks. Nearest supermarket is Bulladelah who also have a great bakery (bread cheaper and better than the supermarket) but there is a local corner store in Seal rocks with basics incl icecream and coffee.
They have BBQ areas which are very pleasant and overlook the beach. For a family holiday (and even for a couple like ourselves) a great choice.