re: Learning a language for a trip

Besides Rosetta stone, Duolingo or Babbel, watch YouTube Videos.

This girl does great tutorials.

Link

At least develop some "go to phrases" to get you started. Write them down, or use some type of Notes app. I use Evernote to save my various "go to phrases" for the various countries I've been to. Nothing like being able to order rakia in Serbian to someone on a cruise that's from there at the bar. Their faces! You da man thereafter.

Nothing beats practicing. There are online tutors you can hire to talk to online. Check out Italki!

Seriously, if you want to learn you have to practice. And it's ok to drop some coin on some of these apps or sites if it's something you want to do. Free stuff only gets you so far.