Hi Steveful,

Good news the Cayman Islands borders are now open to fully vaccinated travelers.
Quarantine is not required for:

Fully vaccinated travellers.
Caymanians/Permanent Residents who were fully vaccinated with an approved vaccine (locally or overseas).
Unvaccinated children age 11 and younger who are assuming the vaccinated status of their adult travel companions.

Sharing the link for the same which has been updated on 1st June 2022.

https://www.dvcstem.com/post/covid-19