Popular Countries Now Making It Harder for Tourists to Visit in 2025

11. Thailand: Island Quotas & "Green Gateway" Certifications

Following successful pilot programs, more of Thailand's popular islands and marine parks (e.g., parts of the Similans or Phi Phi) now operate on strict daily visitor quotas, requiring advance online booking. For 2025, a new "Green Gateway" certification is being prominently awarded to hotels, tour operators, and even beaches that meet high sustainability and ethical tourism standards, guiding travellers towards more responsible choices and rewarding eco-conscious businesses.