This is a 5-page packet I created for a 3-6 Special Ed. class. The content is probably most appropriate for 3-4 grade depending on your class' general abilities.
The first page contains a summary of the history of Valentine's day, including two legends surrounding Saint Valentine (includes side note definitions of vocabulary).
The second page contains a summary of where cupid came from (includes side note definitions of vocabulary).
Pp. 3-5 contain Valentine-themed crossword puzzle, word search, and a cupid coloring page which contains a "Roses are red" poem and a spot for students to complete their own "Roses are red" poem.
Reading as a class, and then working on the puzzles, the lesson took about 1/2 hour.