then brainstorm / draw up a list of words or phrases that describe or remind you of John Adams
there are several ways to tackle the problem
a rather easy approach would be to create a short line or a word that starts with each letter of the president's name since an acrostic poem is a poem in an alphabetic script,the first letter, syllable or word of each line of the text spelling out another message.
These words may be adjectives/nouns or traits that describe that president, or they may be words that are associated in some way with that president.