Firearms. Get your FOID card if your state requires one, pick up an inexpensive plinking rifle or handgun, and see if your local gun shops have a group. Learn how to shoot and defend yourself at the same time.

Same thing goes for other martial hobbies - archery, slinging, HEMA, Eastern martial arts, MMA/Judo, what have you. The physical ones will help your health, both physical and mental. With archery and slinging you'll be honing your skills and learning ways to hunt or defend yourself that don't require refined black powder and bullets. Word of warning on historical stuff, though - stay the hell away from most SCA groups, as they are typically pozzed AF.

Hunting/fishing/hiking/camping/other outdoors sports. Your mileage may vary depending on how into outdoorsy stuff you are, but at the very least hiking is a good one. Long walks in nature can help clear your mind and center your spirit.

Creative stuff like painting or sculpting, your choice on medium and style. Other things in the same vein include woodworking and metalworking (including blacksmithing).

In a similar ballpark, learn a musical instrument. Start small if you don't want to drop a lot of cash on it, something like a harmonica or tin whistle. If you want to stick with music as a hobby it then you can move on to something more involved like guitar, piano, sax, or a horn of some sort.

Gardening. You can go for a flower/zen garden if you have the space for it and want someplace to center yourself and meditate as you tend to it, or you can learn more about actual gardening and growing your own foodstuffs. This can also lead to getting into canning/preserves.

Cooking. Learning to properly cook your own food can be very rewarding, and as an added bonus you can eat healthier and you'll likely save money in the long run by not eating carry-out or fast food as much.