Street art tour
Climb Petrin Tower
Bike the Danube River
Hike Untersberg Mountain
Gondola ride
Explore FICO Eataly World
Bike in Chianti
Visit the Colosseum
Climb Montserrat Mountain
Snorkel in Tabarca Island
Visit Aracena Caves
Surfing at Costa da Caparica
Visit the Douro Valley
Cycle in Casa de Campo
If you have more time, add a day trip to Sintra from Lisbon or hike in the Pyrenees Mountains from Barcelona. If you have less time, skip Valencia and Seville. Also, consider booking tickets to attractions in advance to avoid long queues.