Is it okay for mainland tourists to book a group trip to Palau through a Hong Kong travel agency?

No matter where you sign up for a group tour, the travel agency will only buy round-trip air tickets to Palau + book a hotel in Palau, and at most, book overseas activities during Palau. Palau is a visa upon arrival. As long as you hold an ordinary passport valid for more than six months, air tickets to and from Palau, and hotel reservations during your stay in Palau, you will have no problem entering Palau. You didn't explain anything else. If you apply for a transfer from Hong Kong (or Macau) to Palau in the Mainland through a Hong Kong travel agency, you need to purchase the air tickets from the Mainland to and from Hong Kong (or Macau) by yourself with your passport, and when you exit the mainland with your passport, you must not only show the Mainland round-trip ticket For electronic ticket itineraries from Hong Kong (or Macau), you also need to present the electronic itinerary for air tickets from Hong Kong (or Macau) to Palau. Otherwise, if you go from the mainland to Hong Kong (or Macau) without connecting flights, you may be asked to apply for a Hong Kong and Macau pass.