How is the bird watching at Jockey's ridge State Park

Very few. Just some seagulls at most.

It really isn't a bird-watching environment. There is a woods area on the western boundary that would be the only real possibility. If you want woods birds try the Nature Conservancy at Nags Head Woods a couple miles North. If you want waterfowl, go to the Pea Island wildlife refuge south of Oregon Inlet.

Only thing I see flying is kite's

There's a few. That's definitely not the selling point of the park though.

Not many birds in the summer months

We were just there and I didn't see many birds.