Great advice from tis. We'll be there in August too, by the way!
For dining, we love to go to Shades at the Loop and I am always happy to grab something at Cowgirl Kitchen in Rosemary. Our absolute new fave is the Pizza Bar in Seaside. Family friendly, reasonably priced and fantastic food. Go early!
I like the Sunday night concerts at the Seacrest pool, too. The kids always have a good time. Don't know how late they will go this year.