Walkable town, white sand beach, not hours from an airport.. does it exist?

Looking for our next beach vacation, but I do not like having to drive everywhere on vacation. We have 4 kids so all inclusive hotels don’t seem to fit us very well. Open to any location but looking for : a walkable town, amazing beaches ( Thought Caye Caulker Belize was it, but my research taught me the beaches there are not it) , and not hours driving from the airport. Cruz Bay St. John USVI – is « it » that I’m basing all this on. There’s got to be somewhere else cool that fits.