How Many Days to America? A Thanksgiving Story by Eve Bunting is a great companion book to the story of America's First Thanksgiving. I've used this book as a read aloud, but it could be used with a small reading group. The skills included in this unit are the following:
antonyms - 1 easier level and 2 harder levels
punctuation - period and question mark
Some of the worksheets could be used as a center activity, especially if it is a review skill.
If you are looking for extra antonym practice check out my Antonym Ice Cream Match.