Views menu tabs with a dynamic view
You need to understand that the default tab is not used for anything but the title and the weight of it. For an example, check node/%node/view in node_menu. Also check how node/%node is not a tab and yet when you are on example.com/node/1 you see the View because it's the default.

So. Since Drupal already provides a page on taxonomy/term/% all you need to add is a dummy Views display contents irrelevant, path should be taxonomy/term/%/does_not_matter_what with the title 'Overview' and a nice, negative weight and "default menu tab". All other displays are going to be "menu tabs" plain and these can get paths like taxonomy/term/%/travel.

You can play the same game with a Views display of your own instead of a Drupal provided page if you set that display as a page and the dummy as a children. 

To summarize


Have a page, a Views display or a Drupal page at foo/bar.
Add a display at foo/bar/dummy with the title of the default tab and set it as type default tab.
Now add any number of foo/bar/baz displays with the relevant titles as a normal tab.