This is an article we highly recommend you read. Summer boredom can be a great thing for kids. Boredom can actually help a child become more self reliant.
"Our daughter has been at this school for two years, and we find it to be such a lovely, warm and pressure-free educational environment. Our daughter has learned so much, but her learning is, in the true Montessori tradition, self-directed rather than teacher-led. It's true that the class sizes are fairly large, but that's actually entirely consistent with the Montessori philosophy, which values independence and gives children the space and time to work on their own rather than under the constant supervision or with the constant direction of a teacher. Every child is different I guess, but mine loves this school, and I would highly recommend it."