Assuming you're not interested in staying in Orlando (50 miles to the west), where you'll find loads of reasonably priced family lodging, your best best is Cocoa Beach, a notable local surf spot. The Hilton Cocoa Beach Oceanfront is a beachfront, four-star spread with surprisingly affordable rates (there's currently a summer deal for $119 per night). Sign up for surf lessons at the famous Ron Jon Surf School, fish off Cocoa Beach Pier, or explore surprisingly wild Cape Canaveral National Seashore. And then, of course, there are all those famous NASA and space-related activities and attractions.