Hiking, (whitewater)kayaking, hunting, fishing, archery, shooting, (mountain)biking and climbing groups are a good place to meet new people., depending on your interest.

Also, jointing a BJJ gym is a great way to meet new people. I have found most folks that train are super friendly.

You could also try volunteering somewhere.

I know when I transitioned out of the military, working on a farm was great way to transition.