Question

my number one goal this year is to snorkel. predicate nominative adjective adverb

Explanation:

In the sentence "My number one goal this year is to snorkel", the phrase "to snorkel" functions as a predicate nominative (also called a subject complement) because it follows the linking verb "is" and renames or identifies the subject "goal". An adjective would modify a noun/pronoun, and an adverb would modify a verb, adjective, or other adverb, which "to snorkel" does not do here.

Answer:

predicate nominative