Bratislava Castle is a must see. Great views over Bratislava, a cool museum to have a look about in (it costs though) and, if you walk back into the city, there's some cool little bars to keep you occupied on the way down.
Warning - if you get a tram, make sure to buy a ticket. They're very, very inexpensive and you don't want to be caught without one. Two of the lads I was travelling with got stopped by plain clothes inspectors who wanted £35 from them (known as a tourist fine).
My mates kicked up a fuss until a policewoman came on, told my mates to pay up or else they'd be taken to the police station, and then left. Not very pleasant.
Also, stay away from the train station area, a very dodgy area. I've never been propositioned as many times in my life!
Send your feedback or queries to email@example.com