I am the same, a few pretty good days followed by some not so good days (when the realization of everything hits).
It is funny, I have the kids this weekend as well and was also thinking zoo. I also coach my D6 soccer team and S8 baseball team and we have practices and games this weekend so that will keep my busy.
I joined this professional oganiziation earlier in the week to help stay busy, especially when the kids are at mom's. It is pretty cool. It is more geared towards young professionals (just barely qualify) but they sponsor happy hours, hikes and mixers. Kind of weird do this type of thing but I already have a couple of new "friends".
I also spent some time working on my short and long term goals to give me some motivation and to help GAL; made me feel better.
You know this, but staying busy, which helps you feel good about yourself (confidence) is so important for us.