Writopia Lab Summer Workshop: One week of summer workshop, 3 hours/day to work on creative writing with published authors and peers. 

From the website:

Workshops have a maximum of six students and are led by a published writer who has been fully trained in our time-tested methodology. In each of the past three years, more kids from Writopia Lab have been recognized on both the regional and national levels by the Scholastic Art & Writing Awards than from any other school in the nation.

Schedule available at: www.writopialab.org