If your reading textbook is anything like mine, it jumps back and forth from one genre to another each week and sometimes I just don't feel like students have had enough time to interact with a single genre in order to really know it.
Each genre study lasts between 2 and 3 weeks, depending on the length and difficulty of the book. This allows enough time for the student to really interact with respond to the text with a written response and a product.
Books can be assigned or chosen by the student and because the products and responses are very general, they can be adapted to any reading level.
Students love to make their own passport. As they "travel" through the different genres throughout the year they are able to have their passport stamped.
Do something special at the end of the year for the students who have "traveled" through all genres!