Went there last year, early September - weather was terrible and the van had power issues, which put a real downer on the experience. Hopefully you'll have good weather and a great time - as you say, the beachside location is great.
Be aware that the soil is very sandy (yeah, who knew a beachside site would be sandy?) and you'll need appropriate, screw-in tent pegs if you intend to use an awning/canopy/tent/wind break. We only had standard pegs and they just wouldn't stay put in the soft soil.