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This research comprised of three major objectives: 1) study on physical carrying capacity (PCC), 2) study on the level of recreational use, and 3) compare the physical carrying capacity and the level of recreational use. Three of the main tourist sites in Than Bok Khorani National Park, Krabi Province, were selected for the study areas including Hong Island, Pakbia Island and LaoLaDing Island. Geographic Information System (GIS) was applied to identify the size of the available space for recreational use of each site. Additionally, 600 questionnaires were distributed to both international and domestic tourists. The results presented that the PCC of Hong Island, Pakbia Island and LaoLaDing Island were estimated at 1,564 tourists per day, 1,044 tourists per day, and 269 tourists per day respectively. With reference to the physical carrying capacity comparing with the number of hourly tourists, it presented that the level of use at LaoLaDing Island was over PCC both high and low season, while Pakbia Island was over PCC only during high season. For Hong Island, the number of visitors was not exceeded the PCC neither high nor low season.
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