On your next trip to Costa Rica, do yourself a favor and venture outside of the city of San José, where most flights into the country disembark. On a recent trip, we headed 60 miles northwest of the capital in search of dense rainforest hikes, relaxing thermal spas, and the "frog walk," a guided tour by Arenal Oasis Wildlife Refuge where you look for 25 indigenous species. On top of that, we hiked, zip-lined, and bathed under a crashing waterfall. See the full slideshow here.