They were always planning to do the Golbez arc after 6.0 -- you can tell from all the FFIV references, going to the moon, etc.

"Newfound Adventure" means just that -- the start of something new, after the whole Hydaelyn/Zodiark saga has concluded.

As for relaxing and going on "vacation," well they sort of gave us that vibe with Island Sanctuary. The patch MSQ started off with a lighthearted premise, going hunting for a fabled island of treasures. This is a fantasy MMORPG with a focus on combat and story, they can't literally have the main protagonist lounge around on a beach doing nothing. That's not a game.

Also, why has everyone convinced themselves that Dawntrail is all about the WoL going on a beach vacation, like we aren't going to have any real reason for going there? This seems like a huge assumption, based on one very brief teaser trailer. We're even seen engaged in combat for a bit in that trailer, what kind of "vacation" is that?? The expansion story could start out calm and light, but within the first half hour or so things are going to go screwy and we'll wind up finding out about something sinister that needs fighting.