Those are very good projects - don't back down on any of them.
Of course, you have much more experience that I do in this matter (I reckon*), but here's something that I've learnt so far about marriage: it's really important to take care of yourself - not to let yourself down, not to "give up" too much of what makes you happy.
Otherwise we would end up simply wasting the most precious thing that we have on this Earth, something that we have very very little of in the grand scheme of things -- time.
Consider -- would you be happier with her (the way she treats you) or without at this point? If you think that you would be happier -with- her, well, try to fix the relationship and maybe it'll all work out.
If it's the other way around, though... You see, unlike me, you already lived a third of your life next to this woman. You don't have to "wait and see" how it's going to be like -- you already know.
So if you, deep in your own heart, feel that you would be better off without her (don't think of it as 'alone' -- you will always have your kids, and I deeply believe that our relationships with our children should not be affected by our relationships with our women), then you will finally have the chance to do things that you always wanted but never could.
So yeah, just some words.
From practical advise I would recommend sports, hobbies, meeting friends, driving on a race track, reading, and so forth.
Drinking I would argue against because you'll just think that you're oooh so miserable and **** while in fact you're what you want yourself to be -- just like any human being.
*Not to mention, I believe it's a big difference whether you have a 1.5 year old daughter like I do or kids who are already young adults.
Cheers and best of luck.