Two friends and I have a one night layover in Panama city in a few weeks... we arrive fairly late (8 pm) and leave fairly early (9:30 am) the next morning.
Is there anyway to do a night tour?
Visiting the canal is the absolutely most boring thing to do in Panama. Take an Uber, ask it to take you to the Causeway, and voila! you'll have the Canal. Take a picture of the Bridge of the Americas on the left side and of the Panama City Skyline on the right side, and then tell the Uber to take you to Casco Viejo, and have a great time!