There is loads of nice things. Absolutely go to Greenwich park, the Observatory, stroll out to Blackheath, where the Peasants Revolt rested and gathered before decending on London, and back down the Hill to the National Maratime Museum (see the coat Lord Nelson wore when he was shot!), look around central Greenwich. pop into St Alfreges Chruch (Thomas Tallis is buried there), walk the foot tunnel to the Isle of Dogs and admire the view back across the river from Island gardens. Take a 177 bus downstream to visit the Thames Barrier, and then visit the Eighth Wonder Of The World aka known as TH