In addition to biodiversity reserved area, the complex has also been utilized as a green tourism or
eco-tourism site under enforcement of national park act B.E. 2504 (or A.D. 1961) with additional amendment in
B.E.2532 (or A.D.1989). The development of the area to serve tourists can degrade the forest resource through
pollution from tourist invasions. The National Park Committee faces challenges because future benefits from
inscription as a UNESCO World Heritage Site can influence and threaten biodiversity and sustainable living in the
complex (Albers & Robinson, 2007), which, eventually, could give reason to retract its world heritage award.
Thus, this research is initiated under the strategic issues management for sustainable green tourism of the world
heritage master plan. The aim of this research is to study tourists’ expectations and perceptions of environmental
issue management in the park. The data will help the national park committee to manage the complex, create
additional values, and sustain development. The research objectives are, firstly, to identify tourists’ expectations and
perceptions of environmental issues management, which comprises six aspects: pollution, facilities, safety,
regulation enforcement, eco-tourism activities, and stakeholder collaboration. Secondly, the comparison between
tourists’ perceptions and expectations identifies the existence of a gap in tourists’ perception. The results should help
stakeholders in selecting priority issues to be managed and additional control required. Figure 1 illustrates the
research model