Writer's groups, readings, bookstores can be great, libraries can, too, yoga, exercise classes, running or cycling groups, painting, drawing, sculpting, glass-blowing groups, etc. Volunteering at an animal shelter.

I agree with the good advice above. Common interests are always helpful. The important thing is for you to feel at home and comfortable being exactly who you are, because if you are not, that will be instantly picked up on and will make it harder to connect with people.