The sun came out for them this morning, as did the crowds, as they took in the sights of St Ives for the very first time. They've also been to visit St Michael's Mount.
Our Cornwall Correspondent Steve Hardy has been following their day:
The Queen steps on to the quayside at Marazion. Credit: Andrew Winning/PA WireQueen Elizabeth II leaves an impression of her feet in a mould as she arrives to visit to St. Michael's Mount. Credit: Andrew Winning/PA WireFollowing in Queen Victoria's footsteps, The Queen has left an imprint of her feet at St Michael's Mount. Credit: ITV News West Country
Members of the press travelling over to St Michael's Mount. Credit: ITV News West CountryCrowds gathering in Marazion hoping to get a glimpse of The Queen and Prince Philip. Credit: ITV News West CountryWaiting on the quayside for The Queen and Prince Philip. Credit: ITV News West Country
The Queen meets members of St.Ives' lifeboat crew. Credit: Tim Ireland/PA WireThe Queen and Prince Philip receive a photograph from 9-year-old William Perkin during a visit to the RNLI station in St Ives. Credit: Tim Ireland/PA WireThe Queen greets members of the public following a visit to the RNLI station in St Ives. Credit: Tim Ireland/PA Wire
Large crowds have gathered by the town's lifeboat station. Credit: ITV News West CountrySchoolchildren waiting for the Queen. Credit: ITV News West Country