Mike,
In July bring your family east to Nova Scotia. It's not crowded and the sunrise trail area has the warmest water north of the Carolinas.
http://www.destination-ns.com/
Lots of seafood, interesting trails and walks and if you get tired of over 400 years of European history, you can visit one of the First Nations' sites. On top of everything else, the exchange rate is usually favorable.
(Hey, I work in the tourism sector)
Les