B.W.
I want your problem--I miss being a full-time parent now that I am single and am teaching full time and running crazy with kids' activities. My first thought is volunteer at your kids' school! You could read with a child that needs it and it's hard for the teacher to give that individual attention--or make copies, do some cafeteria supervising etc etc. Outside of the school setting, So many volunteer needs--homeless (Berry Good Buys-Safe Haven). Not your thing? Museums always need docents--Natural History Museum, Cowgirl, Kimbell, Amon Carter etc. Why are your kids gone until 6 pm? Pick them up after school and go do fun things with them--savor the time with them! Good luck...