Submitted my resignation, they asked me to design a program proposal?

I am leaving in a month from my non-profit agency. In the 2 years I have been here, from time to time when leadership asks for "big ideas", I have suggested for them to develop a trauma department. Today, 4 days after I submitted my notice, the Clinical Officer emails me to ask what my ideas are and what it would look like.
Trauma therapy is my specialty. I have 13 years of experience as a trauma therapist and 5 of being an advanced trauma therapist. I want to be helpful and help clients, but I don't want to be dumb and give them all my ideas for them to use. What do you think?