Leicester Square, London
If you happen to be in London, a great way to spend your evening would be walking around Leicester Square. It's a very lively place with many street side cafes, comedy stores, souvenir shops, some of the best ice cream parlours, cinemas, eating joints and much more. Also, its a short walk from Piccadilly Circus an China Town too is just around the corner.
There is a fair bit of redevelopment happening; trust it's for the Olympics
The Empire Cinema
The multi-level M&M store