Singapore
South Georgia and the South Sandwich Islands
Some destinations on the current list that would typically be popular holiday options, including Singapore, Australia and New Zealand, are not welcoming travellers so inclusion on the Green List doesn't automatically mean UK tourists can go there.
Of the destinations that are accepting tourists, Portugal and Iceland seem the most likely picks for a holiday. But let's not forget the island destinations deemed "Green" by the UK authorities. Other than Gibraltar, which is a peninsula rather than an island, you'd be hard-pressed to find any of these locations listed among the world's most-visited places.