Princess Beatrice, who took part in the run, said being among the first to cross the Olympic finish line was an extraordinary moment in what should be "a memorable year for the nation".
Men's winner Tommy Davies said winning the race was fantastic. "This is a once in a lifetime thing," he said.
More top news
The PM was threatened with a fresh challenge from pro-Europe Conservative backbenchers after a marathon Brexit 'war cabinet' at Chequers.
Three others died on the day of a sightseeing helicopter accident at the Grand Canyon.
The former Manchester United striker told has told ITV News he is campaigning to change the law to an opt-out system.