The Olympic park is huge. It is though nothing more than a pathway to and from the various venues around the site. You could walk it or hitch a ride on one of the buggies if you were lucky. Certainly the only way round for families, etc.
In between though there were distractions other than the successful Park Live big TV screens. You could spend money or just take in the sights. be warned there are few sun and rain shelters. Well actually there are none of those!
Wear sensible shoes and take an umbrella.