Take them to the Ansel Adams exh at Nat Maritime Museum (last admission 16.30), then pub meal at the Trafalgar... then see if they can carry you over the flooded footpath back to Greenwich at high tide whilst fully tanked up.
@Titivulus started
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Take them to the Ansel Adams exh at Nat Maritime Museum (last admission 16.30), then pub meal at the Trafalgar... then see if they can carry you over the flooded footpath back to Greenwich at high tide whilst fully tanked up.