When you're at Jetty Park, if you like BBQ, be sure to go to Madd Jacks Grillin Shack, a few miles down the road toward Cocoa Beach. Beef is excellent; pulled pork even better.
Kids might be a bit young for the Kennedy Space Center Tour, and it's a bit pricey, but you're close by. Watching the cruise ships go in & out should appeal to the kids. Schedule is available online.
EDIT TO ADD: The Kennedy Space Center rocket launch schedule is also online. Easy viewsing from the beach if one coincides with your stay, a little more effort to watch from Kennedy.
