I need to identify important indicators of sustainable in wildlife resorts but my sample size is 30. Is it feasible to use mean score to identify important indicators
I'm not completely certain I understand the question. What sort of sustainability are you looking at in wildlife resorts? I assume you mean your sample is 30 people, right? Did you interview them? What is the total number of the population? You could calculate a sample size here: https://www.surveymonkey.com/mp/sample-size-calculator/
It seems as if your sample is not sufficient. If that is the case, your findings are not generalizable to a broader population. You may use mean score, however, you'll want to clearly indicate that the number is purely for illustrative purposes, representative only of the sample you spoke to, and is not generalizable to a broader population.
Unless the variation on your samples is quite low - and I strongly expect it won't be if nature is directly involved - then I don't think a sample size of 30 will be very convincing, though it may give good indications.