Dr. Suess is great for any elementary school classroom. His books are usually thought provoking, while also teaching fundamental lessons on language- as in this case rhyming! Rhyming is an important lesson for early childhood students to learn. Word families, word walls, and sometimes sight words have rhyming as a big foundation to these words- which is why this book is great to read to these students. I would say this book's intended audience is K-1st grade. An activity I would do with these students is split them into groups, give each group a core word, and have them come up with as many rhyming words as they can in a minute. A few rounds would be played and they will have been exposed to so many different words in a short amount of time, while also brainstorming! I feel like that would be a great rhyming activity.