The cheapest way for the best tour in Panama, the boat ride and expedition pass next to the ships crossing the Panama Canal today:the huge containner ships, LPG tankers, bulk carriers etc, on the way to Gatun lake with amazing views of the rain forest and exploring different sections of the lake: looking for howlers monkeys capuchino monkeys and the Jeffreys Tamarin monkeys: also iguanas,eagles, cranes herons, it is sighting only we are not allow to feed the animals. After the tour there is one restaurant at walking distance: 15 minutes in the town with panamenian food around 7 dolars the meal, after lunch if you want, it could be a hike from the restaurant to the entrance of the Pipeline road 3 miles observing more nature and then come back to wait the Metro Bus and return to the city:
Very easy by ussing this Moovit App it tells you everything of the subway lines an Metro bus even guides you, just need to buy one card at the subway station and recharge a couple dolars in the machine