If you leave the car at the beginning of the path you can take a slightly longer and more beautiful walk. You will see or hear howler monkeys and alligators at the Gamboa pier
A beautiful place in the rainforest. You can rest, enjoy the surroundings, talk to the guides here who will explain you a lot about the rainforest and the animals. Hummingbirds …
From here, boat tours start on Lake Gatún. However, I cannot judge whether this is only used for tour groups. With luck you will find howler monkeys, sloths, crocodiles, etc.