After becoming friends with a couple from Romania we decided to visit the Balkan Peninsular via a Danube river cruise from Budapest to Bucharest. We arrived a week early to spend some time in Budapest. Hired a Hop-On : Hop-Off Bus — was wonderful. If you have a few days in a city I recommend you check out the Hop on Hop Off Bus. Budapest is actually two cities on different sides of the Danube River, Buda and Pest.