In Gamboa, just 40 minutes from the city, there is a place where you can go, meet and see some sloths, it is called the Sloth Sanctuary.
Punta Vieja Beach and Sloths Island is one of the tours that can be done in Bocas del Toro. In Punta Vieja you can meet the Ngabë Buglë.
Punta Culebra Nature Center of the Smithsonian Institution is in Causeway, Panama. You can see frogs, turtles, corals, fish and more.