For the duration of your stay I'd actually recommend throwing away your netflix subscription! Each country's culture, accent and slang will vary so if you're in Costa Rica watching content from perhaps Spain, Mexico or Argentina each night it might be a tad confusing. e.g. From my experience, a Mexican gangster movie where they call each other "Pendejo" is little help on the streets of Bilbao or Jujuy!

I'd recommend conversational classes. Depending on how much free time you have, a small group of learners, 8 weeks, 90 mins, 3 times a week. I don't know what your financial situation is like but it may be the best several hundred dollars you ever spent - think of it as an investment. It's a commitment to seriously learn a language (because you're paying for it!) in a supporting environment that reinforces what you'll hear in real life.

Develop a daily routine in your local community. Visit the same coffee shop for breakfast and read half a chapter each day of your 'fluency in 25 lessons'. After a few tongue-tied attempts at conversation they'll naturally revert to practicing their English. Explain to a sympathetic ear that you're really keen to speak the language - perhaps only 1 of 4 employees in a café may persevere but that's okay - you then have 3 English speaking friends and one person you only talk in Spanish with. And it's a cliché but be kind to the monolingual elderly lady in your building - she may have a granddaughter she'll fix you up with!

As nerds we may think technology will solve everything but learning apps will only supplement human interaction, so get out there! :) You're in a Spanish speaking country, which is a great start.