Each country has different customs and
behavior traditional values, so travelers have to adapt withto this diversity like people who do vacation, they have to follow the local culture in this county which is visited .
This sounds better if you had presented them in couple of sentences. The second part should come in a new sentence.
customer's - one customer
customers' - many customers
Also, "eager" is not an appropriate word to use for this idea. This is the danger of trying to use synonyms. Eager means " strongly wanting to do or have something" or a keen desire, but this word is used in different situations like;
I am eager to pursue a career in medicine/ I am eagerly waiting to meet you
For this scenario, you can use the words like "wants/ needs/ requirements"