Barcelona has an efficient public transportation system, including buses, metro, and train. A T-10 ticket can be used for multiple rides and multiple passengers until the ten trips are done. Taxis are also available throughout the city, but they tend to be more expensive. Renting a bike or electric scooter is a fun way to get around the city, and it's accessible to anyone as Barcelona has several bike rental points. The best way to save money is by booking breaks in advance or using an all-day pass.
If you have more time, consider taking a day trip to Sitges Beach, located just 30 minutes outside of Barcelona. For a more adrenaline-fueled experience, visit the Bosc Urbà Adventure Park or Komnata Quest Escape Room. Alternatively, if you are short on time, you can consider dropping Park Güell and heading straight to Tibidabo Amusement Park. Lastly, be sure to book your activities in advance since they tend to sell out quickly.