Pequitas is the diminutive form of pecas, which means "freckles". Adding the -ita suffix is a common way in Spanish to make a word sound more affectionate and cute, perfectly translating to "little freckles".
In the song, Alvaro Soler reminisces about being in love with someone's "pequitas en verano" (little freckles in summer). This specific and endearing image beautifully captures the feeling of a young, innocent summer romance, making it a very sweet and memorable word.
This is a super sweet song about a classic problem: being in love with your best friend! Alvaro Soler sings about knowing this person since they were kids, or "Desde que fuimos bien enanos" (Since we were little kids). He admits he was "loco enamorado / De tus pequitas en verano" (crazy in love / with your little freckles in the summer), but he never said anything. Why? He was just too shy and scared, confessing "Mi timidez era más grande" (My shyness was bigger).
Finally, he's decided he can't keep it a secret anymore. Even though he worries "puede que ahora sea tarde" (maybe now it's too late), he's ready to take a chance. His big plan is to ask her to run away with him to a perfect, sunny paradise. The whole chorus is his big invitation: "Ven conmigo pa hawái / A la isla del sol" (Come with me to Hawaii / To the island of the sun), where they can be free and have a great time together.