Final answer:
The phrase uses a simile, a figure of speech that compares two things using 'like' or 'as', to describe the last day of school as being as enjoyable as a day at the beach.
Step-by-step explanation:
The kind of figurative language used in the statement "The last day of school is like a day at the beach - easy and relaxing," is a simile. A simile is a figure of speech that directly compares two different things, typically by using the words 'like' or 'as'. In this case, the last day of school is being compared to a day at the beach to emphasize how pleasant and stress-free it is. This type of comparison helps create a vivid picture for the reader, making the experience more relatable and understandable.