Mountain biking. Especially if you have a local organization for trail management. They’re almost always looking for volunteers.
You’ll have the biking, being active outdoors, some hiking for trail management, typically some fund raising events, bike maintenance/repair workshops, community rides and potentially more depending on the size of the group.
Good variety of activity from solo riding to big social gatherings. And I’ve found it a much more chill group of people than road bikers. And it doesn’t really require the super expensive $2k+ bikes some people opt for. My current ride is at about $700 all in and does everything I need it to do.
Funny thing about that is it’s hard to launch things at the sun.
This is a good short video: https://youtu.be/dhDD2KaflSU?feature=shared