Pura Vida is the all-purpose expression here. It can be used to say thank you or nice to meet you or great, or any time you want to express that you're good, life is good, the world is good.
I was tired when I took this picture of the view from the La Paz Waterfalls Nature Park on Saturday after a long day of excursions. And the altitude had given me a headache, but this panorama did more to make me feel better than the Advil I took. What a beautiful country.