Prague has a well-connected public transportation system, including buses, trams, and the metro. A day ticket for all modes of transportation costs 5 USD, and a single ticket costs 1-2 USD depending on the length of the ride.
If you have more time, consider visiting the Prague Zoo or the Vysehrad Cemetery. If you have less time, you can skip the Dancing House or the National Museum. Additionally, consider taking a boat tour along the Vltava River for a different perspective of Prague's stunning architecture.