It's not far, but you better take the tube to Waterloo and start walking on from there. Once you get to the station, follow the directions and get near to where the Royal Festival Hall is, then walk along the river past Waterloo Bridge and towards the Oxo Tower, The National Theatre and Tate Modern. When the weather is nice (fingers crossed), it's nice to cross over the Millenium Bridge as there are some great buildings on that side of the river bank. Outside the National Theatre there's the regular summertime 'Watch This Space' festival that finishes at around 11pm on weekends (I can pm you the program, if you like), and inside the theatre there is a nice bar that faces onto the river and where you get a great view of Somerset House from its balcony.
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