Camps: Tompkins County Youth Services has a very comprehensive guide to summer camps (and camps the rest of the year) that they publish every spring available in papers like the Ithaca Times. Their yearly camp guide can be found here: http://tompkinscountyny.gov/youth/publications
Information on various sports programs can be found here:
Little Red Lax -This is a youth girls lacrosse program for grades 3-8th
Soccer Shots - This program teaches kids as young as 3 soccer skills in a fun, less competitive environment. Classes take place in 10 week sessions all over Tompkins County, in parks or at local schools and childcares.
Ultimate Athletics in the mall has lots of great classes for kids.