Take a stroll along the bank of Danube, or call a cabbie to drive you around, and enjoy some of the most beautiful sights Budapest has to offer. You will be passing around most of the city's architectural wonders. It gets even better at night when most of the city comes alive in a multicoloured dazzle of lights.
If you do not fancy walking all the way, you can always rest at one of the conveniently placed benches, which line the riverside. Alternately, you can also catch a tram - Line 2 runs parallel to the bank.
Wikipedia https://en.wikipedia.org/wiki/Danube_Promenade
Address 1 Vigadó tér, Budapest 1051, Hungary
Coordinates 47°29'43.994" N 19°2'55.86" E