Aside from exercising regularly and getting out during the day, it's a little tricky to go out at night as would look odd to the kids, but everyone now and then is ok, I know.
40free,
I totally understand, I had the same issue. After separation, there was no way I was giving up my time with my sons just so I could GAL. My GAL became home improvement. Some people om the forum would argue that home improvement is not true GAL. Whatever. It did the trick for me and I could be home with the boys as well. In fact, the boys really liked what I was dong and referred to the house as "The Castle."
At the time, I wasn't sure if I'd be able to keep the house, but my reasoning for working on the house was that, whether or not I kept the house, I would increase the value of the house and I'd benefit either way.
You can also include your kids in your GAL activities. Regardless, I found that getting up early and getting things done was a lot better than sitting around waiting on whatever was in store for me in the future.