Do you think the "blah kind of day" is because the thing you had to look forward to, her going out of town, has now been taken away from you?
Do you enjoy camping? What about a father/son camping trip? Or some other male bonding trip, that simply doesn't include AW. You'd be in control of the plans. You and DS could look forward to and be planning something together.
I have 2 daughters, and several years ago, we began making all-girls trips. It gives me something to look forward to, and the 3 of us have such a blast together.