To explore the city of Budapest what we would recommend is to buy tickets for the 'green hop on hop off' buses. There is a stand for these located all over the city. You will get a pass for 48hrs for £20 each, get on the bus and you will get an excellent tour, with commentry through your headsets. The tour lasts about 2.5 hrs takes you round all the main sights (Heroes Square/city centre/bridges/river/citadel/castledistrict/palaces/museums/parliament etc,etc), nominated stops on your map are throughout this tour and at 3 stops you can get off and onto the 'pink' bus which gives you a different tour route which lasts for an hour. You also get a book of discount tickets which includes 2 free trips each on a river cruise(day time/night time) which has commentary and a bar,very reasonably priced) also there are tickets in your book for restaurants/museums/baths/zoo etc etc, which sometimes save you up to 50%, they are genuine and not a gimmick! NB, we advise you purchase your bus tickets at approx mid day, then you can still use them on the morning of the 3rd day!! . You get an excellent city map with all the stops identified, you can also get a free drink and sample a free bowl of Goulash at one of the stops. This is an excellent way of seeing the City whereby you can get your bearings and decide what attractions you would like to visit another day, and then you can use the bus to get there. We found the drivers and guides very polite.