Doctor Who/Recap/S32/E10 The Girl Who Waited/WMG

The "Number One" tourist destination planet ahead of Appalapucia

 * Is Earth. Within the context of the show, about every alien race we've ever heard of has been here. the Doctor just fibbed to Amy and Rory about the "Planet Of The Coffee Shops" because he didn't want them to know how big a target was painted on our little corner of the galaxy.
 * Alternatively, it was a Starbucks gag.