I'd highly recommend visiting the park at night. Get there by the Olympic Green subway stop on lines 8 or 15, or the Olympic Sports Center stop on line 8.
There are impressive buildings lit in wonderful colors, open spaces to walk, and lots of activity - people dancing, singing, etc. The Bird's Nest, the Water Cube, and the towers are the highlights. Snacks and drinks are available. There was no entry fee.
Important note - the lights to the Bird's Nest shut down at 9:30 the evening we were there.
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