LAX to MIA Cruise Jan 22

[Mayford on Sea]

Now that the US has opened up to us Brits we are thinking about booking the Ovation cruise from Los Angeles to Miami in January 2022. My question is this cruise stops off at countries that are on the UK Red List ie Costa Rica, Mexico. Does that mean we cannot do this cruise or if we do  would we  have to quarantine at a hotel on our return to the UK?