If you have a car, drive to a different coffee shop or café everyday (like Starbucks, Barnes and Noble, Peet's, whatever) and work from there. Spend a few hours there and in the process, try to meet some new people. Talk to them about anything and I guarantee you'll find some way to connect.
In the weekends, there are lots of places (especially if you live in a decently populated city) where people go to to spend time with other people. If you find one of these places (just google it, basically), there's almost always musicians (e.g. Jazz Saxophonists) playing some laid-back music, and tons of people having a great time. Merely being present in a place like that is enough to make you not feel lonely. Your situation might differ but I doubt it would hurt to try these and some of the other ideas other HNers presented.