Tommy could go any place in the world, provided it had three syllables and could conveniently be rhymed with some other word(s). It helped if it was actually a port, but he could be sent far inland to Milton Keynes or even Las Vegas.

Here's a listing of the ports of Britain and Ireland, plus a few of the major ports in the British Empire during the Victorian heyday of shantying. This may help you to make up your own itinerary - one of my "versions" goes to towns and villages in "Shakespeare Country", far from the sea or even an inland waterway in many cases.