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My uncle Robert told us about the time when he backpacked across the island of Luzon.

Aadjective
Badverb

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WorldlyGlass49

I'm not sure what exactly the underlined words are, but I'm assuming it's of Luzon. 
In any case, the correct answer is adjective. 

ailud18

My uncle Robert told us about the time when he backpacked across the island of Luzon.

That part of the sentence fuctions as and adjective since it is modifying a noun.

Adjectives are those words which describe or modify other words(nouns) , making your writing and speaking much more specific, and much more interesting. They are usually positioned before the noun or pronoun that they modify.

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