THE HAGUE, Netherlands â As coronavirus infections decline in parts of the world and the summer holiday season tentatively begins, the Dutch government has eased travel restrictions for a group of popular vacation destinations. Among the countries with a lower risk of infections that can be visited starting Saturday are Portugal, Malta, Ireland, Thailand, Rwanda, the former Dutch colonies of Aruba, Curacao and Sint Maarten and a large group of Greek islands. They previously were designated code orange, meaning the government advised only traveling there if it was urgently necessary. The Greek mainland and Crete remain under code orange. The destinations are now yellow code, meaning Dutch travelers can visit without having to undergo a COVID-19 test and go into self-isolation on their return.