Combination of GIS capabilities with MCDM techniques involves the phases of intelligence, design
and choice [25]. However, a fundamental problem of decision theory is how to derive the relative weights
of the criteria. Thus, one disadvantage of this method is the inherent subjectivity of assigning preference
values between criteria and its complexity in the computation of the criteria weights [14]. The results of
this study may only work in the prevailing situation of ecotourism in Surat Thani Province. However, the
same principles may be also applicable elsewhere. There are a number of ways in which future research
could strengthen the validity of the findings. Implement activities of the selected ecotourism suitable sites
must be continued and more concrete.