The objectives of this research were to study 1) domestic tourism behavior of foreign tourists; 2) factors affecting tourism behavior of foreign tourists; 3) tourism patterns affecting personal relationship with tourism behavior of foreign tourists; and 4) travel problems of foreign tourists in Prachuap Khiri Khan Province. Research samples were 400 foreign tourists in Prachuapkhiri khan Province. Research instrument was a questionnaire. Data analysis was percentage, mean, standard deviation, and chi-square. The research findings were as follows: 1) the purposes of foreign tourists were to travel and ecotourism; 2) Factors affecting tourism behavior of foreign tourists were economic, political, and status and reputation; 3) tourism patterns affecting personal relationships were ecological, health, nature, history, culture, art and science and sports and recreation; and 4) problems in traveling for foreign tourists were the epidemic of the Covid-19, followed by government measures and accommodation.