High Frequency words for first grade~give them a head start for next year
K-1 decodable books (you can print some for free at Reading A-Z - Samples)
coloring books
Does your community's library have a summer reading program? Perhaps put information from it. Last summer some movie theatres offered free showings maybe they are doing that again this summer?

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All we are and all we see is but a dream in a dream, All that you see or seem, is but a dream within a dream--Edgar Allan Poe