While 5 days is a "short" trip for a country as biodiverse as Costa Rica, it is sufficient for a focused, single-region experience in 2026. For a 5-day itinerary, travel experts recommend flying into either San Jose (SJO) for the volcano/cloud forest region or Liberia (LIR) for the Guanacaste beaches. You shouldn't try to see both; the winding roads and mountain terrain make cross-country travel slow. A perfect 5-day "adventure" loop would involve staying in La Fortuna, where you can visit the Arenal Volcano, soak in hot springs, and go zip-lining, all within 3 hours of the airport. Conversely, a 5-day "relaxation" trip would center on Manuel Antonio, combining white-sand beaches with a world-class national park. If you want to see multiple ecosystems (like both the Caribbean and Pacific coasts), you truly need at least 10 to 14 days to account for the transit time between regions.