Amy - I have just started on your sitch as well. Your post really struck me, so I just jotted a note last night. I like to read every post, so I can speak intelligently.
I have the kids Friday afternoon through Monday night - 50%/50% - so that is awesome. I can't understand men that are happy with every other weekend.
Anyway - I'm embarassed to admit that I need to practice the GAL. I own my own booming computer/web/programming business, so that's the extent of my hobbies.
However, I'm trying - I started working out, and have lost 13 pounds. I'm getting roller skates for my kids, and we are starting that up. Also, just joined the YMCA, so come on pool!
As far as going dark - I even practice it together. W came over to pick up kids past Monday, and she normally is only here for 15 minutes. Kids and I had gone to my folks, and I had been dark Sat, Sun, and Mon. She came in and stayed for hour and a half - was all chummy and cheery. Heh, I went upstairs, put away laundry, etc while she was hanging out with kids - probably for 30 minutes. Ended up probably saying 10 words to her - I was cordial, but distant.