Vienna has an excellent public transportation system with options such as buses, trams, and underground trains. Consider purchasing a Vienna City Card for unlimited travel and discounts on attractions. Taxis and ride-sharing services are also available, but they can be more expensive. Expect to spend around €30-€40 for a taxi ride from the airport to the city centre.
If you have more time, consider visiting the Vienna State Opera, the Prater amusement park, or the Naschmarkt food market. Alternatively, if you have less time, prioritize your sightseeing based on your interests and preferences. Keep in mind that many of Vienna's attractions close early, so plan accordingly.