-What you can expect- Costa Rica's wildest adventures are all natural. And on this tour you'll take on two of Arenal's best outdoor experiences. Cross a hanging bridge over the rainforest and get up close to canopy wildlife like spider monkeys, sleepy sloths and over 400 species of tropical bird. Then, trek along the foothills of Arenal Volcano for a rewarding swim in the emerald pools of La Fortuna Waterfall.