CAMP NITZAN Hebrew immersion in an informal setting combined with activities that children (ages 4-7) love.(this is from their Ad) "The nine-day smart start at Camp Nitzan will enrich the Hebrew program your child attends throughout the school year. A day at Camp Nitzan is an integrated Hebrew learning environment using sports, crafts, music, cooking, games and dancing." http://northernnj.ujcweb.org/page.aspx?id=115273  

Israeli Camp Weebly is in NY in the Catskills.  For 9-13 yr olds this Hebrew speaking camp.  Web site and marketing materials are written in Hebrew.  http://israelicamp.weebly.com/index.html