Well, if I were dating again, I think I would do things like outdoor activity groups (hiking, climbing, kayaking), dancing, cooking & language classes. Mbe groups who meet to go to the theatre or symphony. That kind of thing.
Choose your activities based on the type of gal you'd like to meet.
Have you tried that meetup.com site yet? I've heard its good.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh