While exploring Panamá Canal in one day, it's best to bring comfortable shoes since some points of interest are within walking distance. Uber Taxis or local taxis are also available anytime, which costs approximately $15-20 for a 15-minute ride.
If you have more time, it's worth exploring other historic areas of the city, such as Panama Viejo or the Biomuseo. Meanwhile, if you have less time to go around, soaking up the canal's history and visiting the Miraflores Locks Museum is already a great experience.