Sorry for your loss.
Since you mention not wanting to join a club at this time, I'd suggest just being friendly and open when you travel. Stop for coffee at local diners or a donut shop in the mornings - these are often perfect places to join into some great conversations with strangers. Bring your hobbies outdoors - hobbies are great for opening the conversation lines. If you see someone with a hobby, stop and ask them about it. Fly a kite, walk a dog, take photos of your surroundings (don't take photos of kids or playgrounds - folks get weird about that regardless of whether you're a man or a woman), etc.
The main thing is JUST DO IT. I'm not going to say you'll get over the loneliness, but the feelings behind it will change into something you can handle. As you go, you'll find what works best for you and what doesn't. If you find the nights are the hardest time, get a telescope and star gaze. There will be others who will see you out there and stop to ask questions.