Explore Prague Castle, Charles Bridge, and Old Town
Visit the Schönbrunn Palace gardens and St. Stephen's Cathedral
Explore Bratislava Castle and Old Town
Relax in the Széchenyi Thermal Bath and take a Danube River Dinner Cruise
Visit the Fisherman's Bastion, Buda Castle, and the Hungarian Parliament Building
Enjoy the view from the Eger Castle and visit the Szépasszonyvölgy wine valley
Visit the Špilberk Castle and take in the view from the Brno Observatory and Planetarium
Stroll through the Holy Trinity Column, and stroll the boulevards of the Upper Square
Get lost in the Old Town and swim in the Vltava River
Marvel at the Sedlec Ossuary and the Gothic St. Barbara's Church
Visit the Dancing House, a modern office building in the heart of Prague
Enjoy the morning in Prague before departing from the airport
If you have more time, consider visiting Salzburg, Austria, for its Sound of Music tours, and Graz, Austria, for its evolving culinary scene. If you have less time, consider skipping Eger and Olomouc. Keep in mind that some attractions may require reservation for an entrance/museum tickets, so it's better to plan in advance.