From another poster on another thread...
Some of the "assumptions" I see you and others buying into is that there is no fun but party fun and the rest is boring. Look, drinking and its results are done in the dark for a reason folks!
Organize any of these and the cost is covered by what you spent on drinking.
Get together with some folks to form a group to take scuba diving lessons once or twice a week, and then when certified dive local water and take dive trips to wherever you fancy. You can't safely drink and dive, and real divers tend to not be drunks. You can't drink with your breathing apparatus in your mouth, etc.
Take up riding horses and take proper English tack lessons once or twice a week. Compete in western gymkhanas if you prefer that style.
Train to run, bike, shoot, swim, sail, fly, canoe, skydive - competitively or just for pleasure.
There are many things you can do to keep life from being boring, but you have to actually DO them. Sober life is only boring if you allow it to be.