Good - loving your sober self is the way forward.
I really enjoy the Mensa activities on their website, so I know what you mean about the Maths challenges. Have a little look - You might enjoy them ...
https://www.mensa.org.uk/puzzles
Cake and bubble bath sounds good as well
PS - Does your husband know you're quitting?? You know, it's not at all unreasonable to tell him to buy his own beer for a while - if he's supporting you he will understand this