I find the best kind of mystery is the natural result of "getting a life". Intention is important.
Some ideas:
Get the travel brochures... and then GO.
Take a class or study something you have wondered about
Get out with friends for dinner, movie, museums, whatever you like to do
Entertain at home-- relaxed movie night, dinner party, etc.
Get involved in a professional or community or parent group
Set some personal goals and start working on them
Update your look. Wear something different. Look great. Smell good.
Start working out, even if it's one day a week. (great for stress relief!)
Do things on your own that you'd previously have waited for S to do with or for you.
Try new things and tell S about them if you're on friendly talking terms
Be unexpected and not so predictable.
Be willing to be less available-- not to get a reaction from your S, but because you actually have plans.
Seeming mysterious and confident because we're doing something different might give our Ss something to think about and upset the negative patterns between us. We hope they will pay attention. We don't control when that happens or how.
But it will definitely help us detach, get clearer about what we want and need-- and feel a whole lot better because we are doing it for ourselves!