Try a weekend bicycle trip with a group. Attend bookstore lectures. You get the drift. Make any place work for you. Use a flirting prop.
Dogs work well, as do flashy jewelry, clothing, great books, and interesting briefcases.
Be open to advances. Separate from your old friends so that new friends can approach you. Don't always travel in packs. Many prefer a shy, coy kind of fellow. Have confidence in who you are.