I found these sites in my travels the other day and thought they may be of some interest to someone who may be doing a short study of Columbus Day. I decided to omit the ones that argue against Columbus and went with the more basic, traditional views.
edhelper -unit for grades 4-7
edhelper -unit for grades 2-4
Columbus Day -info with crossword puzzles and word searches
Enchanted Learning -worksheets and activities
Kaboose -some activities and recipes
Teachervision -some free activities and worksheets
About.com -some printables
United States Embassy in Stockholm –interesting read
A to Z Teacher Stuff -lesson plans, activities, and printables
The Holiday Zone -lessons, information, activities and printables
Brownielocks and the 3 Bears– just for fun, interesting read with some humor thrown in
Apples 4 the Teacher -lesson plan ideas, coloring pages, reading lists
I’m sure there are a ton more out there but these should get you started.