Understand. This is just my opinion. But for us. there is only ONE reason to go to the beach, and that is the beach. IF I'm going to drive for hours, and hours to get to the beach. I'm going to stay with in walking distance of the beach. Else I stay home.
In any of the MB CG. PL, OL, LW, MBTP. You are only steps from the sand. You can take a walk on the beach at any minute, with out having to load up, and drive. You can go out, and just sit, and if you need your camper facilities. Just skip back over the dune. Can't do that if you are not staying in an oceanfront CG.
At Easter. The crowds will be smaller. But if you want a quieter CG. MBTP would be the best bet, with PL next. At MBTP, You will be close to restaurant Row, and Barefoot Landing.
The state park is OK, But the campsites are not really walking distance to the beach. They are hiking distance.
Also Easter is late this year. So it very well could be swimming weather, At any rate. OL, LW, PL, have indoor heated pools. Not sure about MBTP, but I think it does.