Budapest is a beautiful city full of history and tradition. It is spectacular after dark! Make sure to take a cruise up and down the Danube even if it's the water taxi. I bought a 7 day metro ticket and found it very easy to get around by underground, bus and tram. I was surprised by the number of people who spoke English (after practicing my Hungarian for 6 months). I had a wonderful time there. The Great Market, Castle hill, Fisherman's Bastian, St. Stephan's, Parliament: take it all in.
Insider Tip:Make sure to see St. Stephan's and the Holy Right Hand.